Correct option is B
In Tennis, the score that represents a complete set varies depending on the type of game being played. In men's singles, men's doubles, and women's doubles matches, a complete set is usually won by the first player or team to win six games and have a margin of two games over their opponent. Therefore, option (b) 6-4 represents a complete set in Tennis.
In some cases, if both players and teams are tied at 6-6, a tiebreaker game is played to determine the winner of the set.