Function returning None syntax

Which of the following will display only the message Hello, World!? The hello_world function should perform the display action and implicitly return None. Assume that the function main is the entry point for the program.

Choose the correct option:

• Listing 1 (a)
• Listing 1 (b)
• Listing 1 (c)
• Listing 1 (d)

Listing 1: Hello World Function (Question 1).

(a)

def hello_world() -> None:
    print("Hello, World!")


def main() -> None:
    hello_world()

(b)

def hello_world() -> None:
    print("Hello, World!")


def main() -> None:
    print(hello_world())

(c)

def hello_world() -> str:
    return "Hello, World!"


def main() -> None:
    hello_world()

(d)

def hello_world() -> None:
    return
    print("Hello, World!")


def main() -> None:
    hello_world()