While working on computer, if we open a document in MS OFFICE WORD, which of…

Correct answer: RAM

Explanation:

• When you open a document, the file is read from secondary storage (hard drive or SSD) and loaded into the computer's main memory (RAM).

• The word processor (MS Word) accesses and modifies the document in RAM so the CPU can process changes quickly; saving writes the updated file back to storage.

• ROM and BIOS are firmware-related: ROM stores firmware and BIOS/UEFI initializes hardware at boot. They are not used to hold or edit application documents.

• The I/O bus is a data pathway used to transfer data between components (for example, between disk and RAM). It assists transfer but is not the working memory where the document is opened.

• Therefore, the main memory (RAM) is the component used when opening and editing a document in MS Word.