The system/370 assembler language

[A].	is a term that refers to the control programs of an operating system
[B].	is used to remember which of the general-purpose registers are currently available as base registers, and what base addresses they contain
[C].	allows multiple programs to reside in separate areas of core at the same time
[D].	allows the programmer to write base registers and displacements explicitly in the source program

Answer: Option D

Explanation:

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