Janessa is playing a board game with two friends. Using a single die, one friend rolled four, and the other friend rolled a three. Janessa needs to roll a number higher than both friends in order to win the game, and she wants to calculate her probability of winning. What is the sample space for Janessa's calculation?

A. [1, 2, 3, 4, 5, 6]
B. [1, 2, 5, 6]
C. [5, 6]
D. [3, 4]