Question: On entry to an external subprogram, register 1 4 contains _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
On entry to an external subprogram, register contains
a the address of the register save area in the calling program
b the address of the first instruction in the external subprogram
c the address of the register save area in the external subprogram
d the address of the instruction in the calling program following the call to the subprogram
e None of the above.
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