Consider a running $C$ program. Match the following access types with

claims on system calls$/$ procedure calls:

A$.$ Merging two trees kept in the heap by just manipulating pointers and not allocating

new space by calling malloc.

B$.$ Adding a new node to a linked list in the heap and allocating space for the new node

by calling malloc.

C$.$ Incrementing a local integer counter variable by one.

D$.$ Reading a file from the disk.

Regular procedure call

Procedure call in general. However, a system call might be necessary for some corner

cases.

System call.