When a subroutine is being called the program does the following: A) leaves the current program, runs subroutine, returns at the end of the next rung. B) leaves the current program, runs subroutine, returns at the start of the same rung C) leaves the current program, runs subroutine, returns at the end of the same rung D) leaves the current program, runs the subroutine, returns at the start of the same rung