In PL$/$SQL:

"I $fa=b"$ means... $($Choose the BEST answer$)$

If it is true, statements under the if statement would be skipped, if not the statements would run in order to make $"$a$"$ set to $"$b$"$

It sets $"$a$"$ equal to $"$b$"$

$($C$)$ The if statement is a decision or check on the following, which in this case is asking if $"$a$"$ is equal to $"$b$"$

It checks if $"$a$"$ and $"$b$"$ exist only.