PC fundamentals — In the term ROM BIOS, what does BIOS stand for?

Introduction / Context:
BIOS is foundational firmware that initializes hardware and starts the boot process on classic PCs. Expanding the acronym correctly is common knowledge for A+/IT support exams.

Given Data / Assumptions:

• The phrase “ROM BIOS” refers to firmware in read-only memory (or flash).
• The acronym BIOS is being expanded.

Concept / Approach:

BIOS expands to Basic Input Output System. It provides low-level routines for device access and performs POST before loading the operating system’s boot code.

Step-by-Step Solution:

Verification / Alternative check:

Textbooks and vendor documentation consistently define BIOS as Basic Input Output System.

Why Other Options Are Wrong:

Options A, B, and D are fabricated expansions; “None of the above” is false because the correct expansion is present.

Common Pitfalls:

Confusing BIOS (legacy) with UEFI (modern firmware) terminology; both serve similar roles but have different architectures.

Final Answer:

Basic Input Output System.