In writing the micro-program, there are two situations in which a field of the micro instruction can be kept blank when it:1. Controls a functional unit2. Causes state to be written3. Specifies the control of a multiplexer

In writing the micro-program, there are two situations in which a fiel

1.	In writing the micro-program, there are two situations in which a field of the micro instruction can be kept blank when it:1. Controls a functional unit2. Causes state to be written3. Specifies the control of a multiplexer
A.	1 and 2 only
B.	2 and 3 only
C.	1 and 3 only
D.	1, 2 and 3
Answer» D. 1, 2 and 3