Answer:
private int[ ] testMethod ( int x )
Explanation:
Before going to the reason first understand the syntax of declare the function.
Syntax:
Access_modifier return_type name (argument_1, argument_2,...);
Access_modifier is used for making the restriction to access the values.
it is public, private and protected.
Return_type: it is used to define return type of the function.
it can be int, float, double.
In the question:
Option 1: private array testMethod ( int x )
it is not valid because array is not valid return type.
Option 2: private int[ ] testMethod ( int x )
int[ ] denotes the integer array. so, the function return the integer array.
Option 3: private double[5] testMethod ( int x )
it is not valid because double[5] is not valid return type. we cannot enter the size of the array.
if we replace double[5] to double[ ], then it valid and the function return double type array.
Option 4: private double testMethod[ ] ( int x )
it return type is double. So, it return the decimal value but not array.
Therefore, the correct option is (b).
