Given the following class definition:

public class Car

$\{$

private double fuelLevel;

public Car$($double gallons$)$

$\{$

fuelLevel $=$ gallons;

$\}$

public void addGas$($double gallons$)$

$\{$

fuelIevel $+=$ gallons;

$\}$

$3$

and this code segment:

Car car$1=$ new Car$(20)$;

Car car$2=$ car$1$;

car$2.$ addGas$(10)$;

What is the value stored in fue LLevel for car $1?$

$30\mathrm{.}0$

$20\mathrm{.}0$

$0\mathrm{.}0$

$10\mathrm{.}5$