Predict the output of the following code snippet:

int a = 1;
int b = 2;
if  (a == b)
    System.out.println("Both values are equal");
else 
    System.out.println("Values are not equal");

1. Both values are equal
2. Incorrect use of the == operator
3. Values are not equal
4. No output

Which of the following is mandatory in the switch statement?

1. break
2. continue
3. case
4. default

What will be the output of Math.floor(-20.10);?

1. -20.0
2. -21.0
3. 20
4. 21

Which of the following is an illegal identifier?

1. age
2. 123abc
3. _value
4. $\text{\textdollar}$salary