In ________ encryption, a key pair is created, where one key is for coding and the other is for decoding

Whenever a new Android activity begins, it replaces the activity that was previously called. The replaced activity's state is moved to a data structure called the ____ stack.

A. activity B. back C. app D. state

Which one of the following lines names a constant needed in a program that computes the price per square inch of a round pizza?

a. scanf("%lf", &radius); b. pi = 3.14159; c. #define PI 3.14159 d. #include e. none of the above