What happens if I forget to initialize a variable?

Group of answer choices

The complier checks for this condition and if the variable is a char, it will be set to A$.$

The complier checks for this condition and if the variable is a double, it will be set to $0\mathrm{.}0$

The complier checks for this condition and if the variable is an int, it will be set to $0.$

The complier checks for this condition and give you a $$variable might not have been initialized$$ message

Nothing happens, the compiler does not care