39. If registers 5 and 6 contain the bit patterns 5A and 58 respectively, what bit pattern will be in register 4 after executing the instruction 5456?

(a) 5C

(b) 5A

(c) B2

(d) 58

40. The 1s complement of 1010 is

(a) 1101

(b) 1010

(c) 0010

(d) 0101

41. To execute a program, the start address of the program is placed in the PC register by ....................

(a) Control Unit

(b) Operating System

(c) CPU

(d) virtual memory