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

$\}$

$\}$

Part $1$

Which of the following would be valid test cases for the preheatTo method?

$($a$)$

check that the oven cannot preheat to less than $180$ degrees

$($b$)$

check that the oven preheats to the specified temperature

$($c$)$

check that the oven returns to $65$ degrees when baking is done

$($d$)$

check that the oven cannot preheat to more than $500$ degrees

Select all possible options that apply.