Suppose you have the following declarations in a program:

String lastName $=\text{'}\text{'}$; $//$Variable that is initialized with an empty string.

int age $=0//$Variable that stores a person's age.

char firstInitial $=\text{'}\text{'}$; $//$Variable that stores a person's first initial.

double gpa $==0\mathrm{.}0$; $//$Variable that stores a person's$/$student$\text{'}$s GPA.

Which declaration is coded correctly?

Group of answer choices

String lastName $=\text{'}\text{'}$;

int age $=0$

char firstInitial $=\text{'}\text{'}$;

double gpa $==0\mathrm{.}0$;