Within a method, an identifier used to name a variable in the outer block of the method can be used to name any other variable in an inner block of the method.

Which of the following are normally used to write a program in a high-level language?

a. a text editor b. a debugger c. a compiler or interpreter d. all of the above are needed

____ was designed by IBM in the 1970s and is the most widely used symmetric cipher.

A. RC4 B. RC5 C. DES D. AES