Which of the following is a type of argument that can be omitted when calling a function?

• A. Positional argument
• B. Default argument
• C. Keyword argument
• D. Optional argument

Answer: (B)

A default argument is indeed a type of argument that can be omitted when calling a function. In Python, when defining a function, you can specify default values for one or more parameters. If the caller does not provide a value for those parameters during the function call, the default values are used. This allows for greater flexibility and convenience when calling functions, as it enables the user to specify only the arguments they want to change, while the rest will take on their defined default values.

For instance, consider the following function:

def greet(name, greeting="Hello"):

print(f"{greeting}, {name}!")

In this example, the greeting parameter has a default value of "Hello". When you call greet("Alice"), the function will output "Hello, Alice!" because the default value for greeting is used. However, if you call greet("Alice", "Hi"), it will output "Hi, Alice!" since the caller provided a different value for greeting.

Understanding how default arguments work is fundamental in Python, as it allows for cleaner code and easier function usage without requiring the caller to provide every argument explicitly.