Question

19 mark for review for which of the following input values will the circuit have an output of true? a a = true, b = true, c = true, d = false b a = true, b = false, c = false, d = true c a = false, b = true, c = true, d = true d a = false, b = false, c = true, d = true

Explanation:

Step1: Analyze the OR gate (A, B)

The OR gate output is True if at least one input is True. Let's check each option:

• Option A: A=True, B=True → OR output: True
• Option B: A=True, B=False → OR output: True
• Option C: A=False, B=True → OR output: True
• Option D: A=False, B=False → OR output: False (so D is out)

Step2: Analyze the AND gate (C, D)

The AND gate output is True only if both inputs are True.

• Option A: C=True, D=False → AND output: False
• Option B: C=False, D=True → AND output: False
• Option C: C=True, D=True → AND output: True

Step3: Analyze the final AND gate (OR output, AND output)

The final AND gate needs both inputs (OR output, AND output) to be True.

• Option A: OR=True, AND=False → Final AND: False
• Option B: OR=True, AND=False → Final AND: False
• Option C: OR=True (from A=False, B=True), AND=True (from C=True, D=True) → Final AND: True

Answer:

C. A = false, B = true, C = true, D = true