Using query strings, what is the purpose of the following code? a. To explain how to use query strings in PHP. b. To show an example of how to cre...

Using query strings, what is the purpose of the following code?

a. To explain how to use query strings in PHP.
b. To show an example of how to create links with query strings.
c. To demonstrate how to retrieve values from query strings in PHP.
d. To explain the purpose of the $_REQUEST superglobal variable.
a. a and b are correct.
b. b and c are correct.
c. c and d are correct.
d. a and d are correct.