Consider the following statements about the STRIPS representation of a…

Concept

A planning representation can organize knowledge around state features or around actions. Classical STRIPS is action-centric: each action schema states when an action is applicable and how it changes a state.

In the feature view used for planning, primitive features are independently set, whereas derived features are inferred from other features. Basic STRIPS effects are unconditional add/delete changes; conditional effects belong to richer extensions.

Application

• Statement A is false because STRIPS is classified as action-centric, not feature-centric.

• Statement B is true because the state description distinguishes primitive features from derived features.

• Statement C is true because every STRIPS action schema has preconditions and effects.

• Statement D is false because basic STRIPS cannot directly encode effects that depend on an additional condition.

Contrast the choices

• “A and C only” includes the false classification in statement A.

• “A and D only” includes both the false feature-centric classification and unsupported conditional effects.

• “B, C and D only” adds statement D, which requires an extension beyond basic STRIPS.

Cross-check

The defining STRIPS action-schema pattern is preconditions plus unconditional add/delete effects. That pattern confirms C, rules out D, and the representation taxonomy confirms B rather than A. Hence the correct combination is B and C only.