Calculator is(66) for performing arithmetic operations, but that requires human intervention to alter its stored program, if any, and to initiate each operation or sequence of operations. A calculator performs some of the functions of a computer, but usually operates only with frequent human intervention.Microcomputer's processing unit consists of one or more microprocessors, and includes storage and input-output(67). Personal computer primarily intended for(68) use by an individual.(69) computer can be hand-carried for use in more than one location. Minicomputer is functionally intermediate between a microcomputer and a mainframe. And supercomputer has the highest processing speeds available at a given time for(70) scientific and engineering problems.

A. suitable
B. well-formed
C. applicable
D. usable