What is the main difference between a mainframe and a super computer?

a. Supercomputer is much larger than mainframe computers
b. Supercomputers are much smaller than mainframe computers
c. Supercomputers are focused to execute while the main frame used its power to execute as many programs concurrently
d. Supercomputers are focused to execute as many programs as possible while the mainframe used its power to execute a few programs as fast as possible