In a common bus system constructed using multiplexers for 8 registers of 16 bits each, how many selection lines are required for the multiplexers?

Subject: Computer Architecture and Organization

Topic: Register Transfer & Microoperations

Options:

1. Option A: 2 selection lines
2. Option B: 3 selection lines
3. Option C: 4 selection lines
4. Option D: 8 selection lines

Correct Answer:

Option B: 3 selection lines

Explanation:

To select 1 out of 8 registers, 2^n >= 8 => n = 3 selection lines (S2, S1, S0) are required for each MUX.