A Stack-organized Computer uses instruction of ?

(A) Indirect addressing (B) Two-addressing (C) Zero addressing (D) Index addressing

How many addition and subtraction operations are needed when using Booth's algorithm to multiply a number X by the multiplier "110001001"

(A)2 additions and 2 subtractions (B) 2 additions and 3 subtraction (C) 3 additions and 2 subtractions (D) 3 additions and 3 subtractions.