Fill in the blanks:
Given a variable x, ___ decreases the value of x by 1 and returns the original value,
while ___ increases the value of x by 1 and returns the new value.
A.
Prefix operators, such as --x and ++x, modify the variable and evaluate to the new value, while postfix operators, such as x-- and x++, modify the variable but return the original value. Therefore, Option A is the correct answer.