The meaning of the RET instruction is: A. Terminate the main program to jump to the first instruction in subroutine B. Terminate the execution in the subroutine program and return to the main program O C. Terminate the main program to serve the input/output devices D. None of the choices Clear my choice The most suitable flip-flop (f/f) to construct a register is: A. Tilf B. SRff C. JKM D. DHE DEL Clear my choice