A function can A. return a value B. perform a task C. change value of actual arguments in call by reference D. a, b, c above are all true E. None of the above

The correct answer is D.

A function can return a value, perform a task, and change the value of actual arguments in call by reference.

A function is a block of code that can be called repeatedly. It can take input values, called arguments, and produce output values, called return values. Functions are often used to group related code together and to make code more modular and reusable.

When a function is called, the arguments are passed to the function and the function’s code is executed. The function can then return a value, which can be used by the code that called the function.

Functions can also change the value of actual arguments. This is called call by reference. When a function is called by reference, the actual argument is passed to the function as a reference to the variable in the calling code. This means that the function can change the value of the variable in the calling code.

Here is an example of a function

def add_numbers(x, y):
return x + y

This function takes two arguments, x and y, and returns the sum of x and y.

Here is an example of a function that performs a task:

def print_message():
print("Hello, world!")

This function does not return a value, but it does print the message “Hello, world!” to the console.

Here is an example of a function that changes the value of an actual argument:

def change_value(x):
x = 10

This function takes one argument, x, and changes the value of x to 10.

In conclusion, a function can return a value, perform a task, and change the value of actual arguments in call by reference.