What is the syntax error in the following lines of code?

if $($isWalking $==$ true$)$ ;

System.out.println$("$Walking$")$;

$\}$

else $\{$

System.out.println$("$Not Walking"$)$;

$\}$

Group of answer choices

The boolean expression should only have one equal sign and not two.

There is a semicolon missing after the word else.

There should be an open curly bracket after the boolean expression and not a semicolon.