In a calculator which Java feature allows multiple methods named calculate() for the different operations?

1. abstraction
2. inheritance
3. encapsulation
4. polymorphism

Assertion (A): The result of the Java expression 3 + 7/2 is 6.

Reason (R): According to the hierarchy of operators in Java, addition is done first followed by division.

1. (A) is true and (R) is false.
2. (A) is false and (R) is true.
3. Both (A) and (R) are true and (R) is a correct explanation of (A).
4. Both (A) and (R) are true and (R) is not a correct explanation of (A).

To extract the word NOW from the word "ACKNOWLEDGEMENT", the Java statement "ACKNOWLEDGEMENT".substring(3, ...............) is used.

Choose the correct number to fill in the blank.

1. 6
2. 7
3. 5
4. 8

The output of the below statement is:

String a[] = {"Atasi", "Aditi", "Anant", "Amit", "Ahana"};
System.out.println(a[1].charAt(1) + "*" + a[2].charAt(2));

1. da
2. d*a
3. ti
4. t*i