What is wrong with the following code snippet?

int size $=42$;

$cost=9\mathrm{.}99$;

System.out.println$("$size $="+$ size$)$;

System.out.println$("$ cost $=+cost$;

The code snippet uses a variable that has not yet been initialized.

The code snippet uses a variable that has not been declared.

The code snippet attempts to assign a decimal value to an integer variable.

The code snippet attempts to assign an integer value to a decimal variable.