Variables are: a. Symbolic names made up by the programmer that represent locations in the computer's memory b. Operators that perform operations on one or more operands c. Symbolic names made up by the programmer whose values cannot be changed d. Reserved words

a. Symbolic names made up by the programmer that represents locations in the computer's RAM.

Step-by-step explanation:

Note that in programming, variables value can change, depending on the instructions of the programmer.

For example, if two values 10 and 20 are to be stored in a program and used.

The Programmer would do the following:

Create variables with symbolic names, Store the values in those two variables, Retrieve and use the stored values from the variables.

A variable name could be like age, sex, salary, year 2020 etc.