What feature does the System/370 assembler language provide?

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It denotes the control software components of an operating system.It supports running several programs simultaneously in distinct memory segments.It enables the programmer to specify base registers and displacement values directly within the source code.It keeps track of which general-purpose registers are free to be used as base registers and their associated base addresses.

Explanation

Option A refers to operating system control programs, which is unrelated. Option B describes memory management for multiple programs, not assembler language features. Option C correctly states that the assembler language allows explicit coding of base registers and displacements in the source program. Option D relates to register management, not the assembler language itself.