What will be the output of the following Java program?

import java.util.*;
class Output
{
    public static double sumOfList(List<? extends Number> list)
    {
        double s = 0.0;
        for (Number n : list)
            s += n.doubleValue();
        return s;
    }
    public static void main(String args[])
    {
        List<Integer> li = Arrays.asList(1, 2, 3);
        System.out.println(sumOfList(li));
    }
}

What is the main purpose of generics in Java?

A. To enable type-safe collections and eliminate type casting

B. To increase program execution speed

C. To simplify the syntax of Java code

D. To improve memory management

Which symbol is used to denote a generic type parameter in Java?

A. `&`

B. `@`

C. `#`

D. ``

In a generic class, what does the wildcard `` represent?

A. A wildcard type

B. A specific class

C. An unknown type

D. An exception type

What is the benefit of using generics with collections in Java?

A. It allows collections to store any type of elements

B. It ensures type safety by allowing only specific types of elements

C. It reduces the size of collections

D. None of These