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