final double $\frac{?}{PI}=3\mathrm{.}14$;

int $x=17$;

boolean issafe $=$ false;

$\frac{?}{PI}=3\mathrm{.}1415$;

double area $\frac{?}{P}=$I $**12\mathrm{.}3$;

$y=x$;

One of the variables contains an illegal identifier.

Nothing is wrong with the code example.

One of the variables has been declared more than once.

One of the statements attempts to modify a constant.

One of the variable is assigned the wrong type of data when it is initialized.

One of the variables has not been declared.