The _________ scheme has reigned supreme as the most widely accepted and implemented approach to public-key encryption.

CRC stands for __________.

a. Class, Recyclability, Collaborations b. Class, Redundancy, Collections c. Class, Responsibilities, Collaborations d. Code, Reuse, Constancy

____ keys on a keyboard are used for issuing commands in some programs.

A. Alphanumeric B. Number C. Arrow D. Function