Which of the following statements is false?
a. The method’s return type specifies the type of data returned to a method’s caller.
b. Empty parentheses following a method name indicate that the method does not require any parameters to perform its task.
c. When a method that specifies a return type other than void is called and completes its task, the method must return a result to its calling method.
d. Classes often provide public methods to allow the class’s clients to set or get private instance variables; the names of these methods must begin with set or get.

Option (a) the return type of the method specifies the type of the data that is returned for the method calling. The return type can be void if it doesn't return any value. The method return can be int, string and bool etc. So, option (a) is true and it not the correct option.

Option (b) is true it doesn't need any parameters. So, option (b) is not the correct option.

Option (c) is true. If the method has some return type other than void it must return something according to the return type.So, option (c) is not the correct option.

Option (d) is false. Getters and setters methods are used for accessing private variables but the name MUST start with get or set is false. The best practice is to start with get and set but it is NOT a must.

So, option (d) is correct option.