Which of the following code segments can be used to interchange the values of the variables num1 and num2?
A
num1 ↔ num2
num2 ↔ num1
B
temp ↔ num1
num1 ↔ temp
num2 ↔ num1
C
temp ↔ num1
num2 ↔ num1
num1 ↔ temp
D
temp ↔ num1
num1 ↔ num2
num2 ↔ temp