What are the potential winnings and probabilities for a player in a game where they roll a fair 20-sided die and win $7 if they roll a 4, win $6 if they roll an 8 or 18, and lose if they roll any other number?
a. Potential Winnings: $7, $6, -$1 Probabilities: 1/20, 2/20, 17/20
b. Potential Winnings: $7, $6, -$1 Probabilities: 1/20, 1/10, 9/10
c. Potential Winnings: $7, $6, -$1 Probabilities: 1/20, 1/20, 18/20
d. Potential Winnings: $7, $6, -$1 Probabilities: 1/20, 3/20, 16/20