$8\mathrm{.}8$ The following operations are performed on a stack:

PUSH A$,$ PUSH B$,$ POP, PUSH C$,$ PUSH D$,$ POP, PUSH E$,$

POP, POP, PUSH F

a$.$ What does the stack contain after the PUSH F$?$

b$.$ Atwhichpointdoesthestackcontainthemostelements?Without

removing the elements left on the stack from the previous operations, we perform:

PUSH G$,$ PUSH H$,$ PUSH I, PUSH J$,$ POP, PUSH K$,$

POP, POP, POP, PUSH L$,$ POP, POP, PUSH M

c$.$ What does the stack contain now?