Which of the following statement(s) is/are true regarding Data Communication?…

Concept: Data-communication modes are classified along two independent axes: how many directions data can flow over a link, and whether both directions can be active at the same time. A two-endpoint link has exactly two possible flow directions (end A to end B, and end B to end A) — so the accepted direction-count terms in this classification are only “unidirectional” (one-way) and “bidirectional” (two-way). There is no separate “multidirectional” category in this taxonomy, because a single channel between two ends cannot carry more than two directions in the first place.

• Simplex: one direction only (unidirectional) — e.g., keyboard to computer.

• Half-duplex: two-way (bidirectional), but the two ends take turns — only one transmits at a time (e.g., a walkie-talkie).

• Full-duplex: two-way (bidirectional) and simultaneous — both ends transmit at the same time (e.g., a telephone call).

Applying this to the two statements: Statement I calls half-duplex “multidirectional communication.” Under the taxonomy above, half-duplex is bidirectional — not multidirectional; “multidirectional” is not a term this classification uses for any of the three modes, so Statement I's wording does not match the accepted description and is false. Statement II calls full-duplex “bidirectional communication.” Full-duplex is indeed two-way (it additionally happens to be simultaneous, which is a separate property), so describing it as bidirectional is accurate, and Statement II is true.

Cross-check — the “multi means more than one, so it must include two” objection: “Multidirectional” is not a defined technical term anywhere in the simplex / half-duplex / full-duplex taxonomy — it is simply the wrong word for this classification, not an overly-broad synonym for “bidirectional.” The reason is structural, not a matter of degree: a link between two endpoints only ever has two possible directions (A→B and B→A), so there is nothing “more than two” for a duplex mode to have. Standard networking terminology (and the exam's own answer key) therefore describes the direction axis using only “unidirectional” and “bidirectional”; the alternating-vs-simultaneous distinction is handled separately by the terms “half-duplex” and “full-duplex” themselves, not by direction-count words. Reading “multidirectional” as a valid label for half-duplex mixes these two axes and does not match how the field defines the term.

Answer: Only Statement II is correctly worded, so “Only II” is correct.