How do you define a generator function in Python?

Answer: Option B

The correct answer is Option B: Using the def keyword and yield statement.
To define a generator function in Python, you use the def keyword like a regular function, but instead of returning a value using the return keyword, you use the yield statement to yield a value. The yield statement suspends the function's execution and returns the yielded value to the caller. Subsequent calls to the generator function continue execution from where it was previously suspended. This allows generator functions to generate values lazily and efficiently, one at a time, as needed.