Final answer:
The question pertains to Booth's multiplication algorithm which uses three registers but could be considered to have a maximum of four if the Q-1 bit is counted as a separate register.
Step-by-step explanation:
The question "What is the maximum number of registers found in the present booth?" likely refers to Booth's multiplication algorithm, which is used in computer arithmetic to multiply binary numbers. The term "present booth" is a bit unclear, but assuming we are discussing Booth's multiplication algorithm and its implementation in digital registers, the algorithm generally uses three registers for its operation; these are the accumulator (A), the multiplier register (Q), and the multiplicand register (M). The operation also typically includes a fourth component, the Q-1 bit, which is considered an additional register or a simple bit, depending on the implementation. Thus, while three is typically the number of registers if Q-1 is considered a separate register, then four registers might be considered the answer. The option D) 4, can be seen as the maximum number if Q-1 is counted as a register.