Given the following declaration of an Oven class:

public class Oven $\{$

private int temperature;

$//$ EFFECTS: constructs an oven whose temperature is $65$F

public Oven$()\{$

$//$ stub

$\}$

$//$ REQUIRES: $180<=$ degrees $<=500$

$//$ MODIFIES: this

$//$ EFFECTS: heats oven to degrees Fahrenheit

public void preheatTo$($int degrees$)\{$

$//$ stub

$\}$

$\}$

Suppose we add the following method specification to the Oven class:

$//$ EFFECTS: returns the temperature of the oven

public int getTemperature$()\{$

return $0$; $//$ stub

$\}$

Which of the following steps would we need to include in the design of a test that verifies that the oven preheats to $300$F$?$

$($a$)$

instantiate an oven

$($b$)$

call getTemperature$()$ on the oven and verify that the value returned is $300$

$($c$)$

check that the oven's temperature is $65$F

$($d$)$

call preheatTo$(300)$ on the oven

Select all possible options that apply