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Solution

Activation record is related to a subroutine call.

When a function or subroutine is called, an activation record is created to store information like parameters, return address and local variables.

So,

$(A)-(III)$

Location counter is used in assembler.

Assembler uses location counter to keep track of the address of the instruction or data item being assembled.

So,

$(B)-(IV)$

Reference count is related to garbage collection.

In reference counting, the system counts how many references point to an object. If the count becomes zero, that object can be removed.

So,

$(C)-(II)$

Address relocation is done by linker loader.

The linker loader adjusts addresses when a program is loaded into memory.

So,

$(D)-(I)$

Final matching is:

$(A)-(III), (B)-(IV), (C)-(II), (D)-(I)$