Final answer:
In golf, when taking relief under a rule, a player may use either the original ball or another ball. This flexibility is allowed before dropping or placing the ball in the relief area.
Step-by-step explanation:
When taking relief under a rule in golf, a player has the option to use either the original ball or another ball. This means that the correct answers are both a) The original ball and b) Another ball, which refers to c) Both a and b. During a round, if a player's ball is to be dropped or placed, they may continue with the original ball they were playing or substitute it with another ball before taking the relief action.