Which of the following

statements is true

?

( a )

T h e

C A L L

i n s t r u c t i o n p u s h e s

r e t u r n a d d r e s s o n s t a c k

( b )

R

ET

i

n s t r u c t i o n p u s h e s r e t u r n

a d d r e s s o n t h e s t a c k

( c )

T h e

C A L L

i n s t r u c t i o n d o e s

n o t h i n g t o t h e s t a c k

( d )

T h e R E T

i n s t r u c t i o n d o e s n o t h i n g

t o t h e s t a c k