Final answer:
The underdirected indentation base control results in minimum base strength and maximum curl mobility. It creates a natural and soft look with the curl cascading down from the root to the ends.
Step-by-step explanation:
The correct answer is d) underdirected.
Underdirected indentation base controls result in minimum base strength and maximum curl mobility. This technique involves placing the hair in a position that is in the middle, but generally closer to the base. It helps to create a natural and soft look with the curl cascading down from the root to the ends.