Which of the following is an advantage of using variables?

a. it reduces the number of functions that are necessary in the program.

b. it increases the number of values that are used in a program.

c. it erases the default values.

d. it makes it less likely that an error will be introduced into the code.

What is the primary difference between the header section of a document and the body? a. the body is displayed on the webpage and the header is not. b. the header is displayed on the webpage and the body is not. c. the tag for the body is self-closing, but the tags for the headers must be closed. d. the tag for the header is self closing, but the tag for the body must be closed.