If int arr [] = {3, 5, 7, 9}; what is the value of arr.length?

1. 3
2. 5
3. 4
4. Cannot be determined

A binary search

1. can be used with sorted arrays only.
2. can be used with unsorted arrays only.
3. can be used with both sorted and unsorted arrays.
4. cannot be used with arrays.

What will be the output of the following code?

System.out.println("Lucknow".substring (0, 4));

1. Lucknow
2. Luckn
3. Luck
4. luck

This access specifier is the most open access level.

1. Public
2. Protected
3. Private
4. Default