Question: The main difference(s) between a procedure call and a system call is (are) that (check all that apply) the procedure call pushes an activation frame

The main difference(s) between a procedure call and a system call is (are) that (check all that apply)

the procedure call pushes an activation frame on the stack, while the system call does not
the system call invokes code written by system developers, while a procedure call invokes code written by the programmer.
the system call traps to the operating system, while the procedure call does not
the system call stores its parameters in one or more registers

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