R Apply Family: Discussion Forum analytics, we recorded the answer upvotes of A and B for the last 6 questions on the forum.

2 more students C and D have come up as competitors to the Forum Leaderboard top scorers. You have to save all the information in these four vectors in a combined vector and combined data frame.

A_upvotes <- c(7, 3, 2, 8, 0, 4)
B_upvotes <- c(2, 1, 3, 4, 2, 4)
C_upvotes <- c(3, 2, 3, 4, 6, 2)
D_upvotes <- c(4, 2, 5, 3, 3, 1)

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