Solution

The correct answer is A - III, B - I, C - IV, D - II

Key Points

• A. Complement
  • Complement is often used in the representation of negative numbers, particularly in binary systems.
  • Correct match: III. Negative number representation
• B. Ex-OR
  • Ex-OR (Exclusive OR) gate is commonly used in adder circuits for binary addition.
  • Correct match: I. Adder
• C. Accumulator
  • An accumulator is a register in a CPU that stores intermediate arithmetic and logic results.
  • Correct match: IV. Arithmetic and Logic operations
• D. Control Unit
  • The control unit is responsible for decoding instructions in a CPU and coordinating the execution of these instructions.
  • Correct match: II. Instruction decoding

Therefore, the correct answer is: A - III, B - I, C - IV, D - II