When Using R, How Do You Store Shipping Costs

Multiple Choice

When using R, how do you store shipping costs?

A) >unit.costs <- matrix(2.81, 3.32, 2.90, 2.88)
B) >unit.costs <- unit.costs(2.81, 3.32, 2.90, 2.88)
C) >unit.costs <- matrix(c(2.81, 3.32, 2.90, 2.88) , nrow=2, byrow=TRUE)
D) >unit.costs <- unit.costs(2.81, 3.32, 2.90, 2.88) , nrow=2, byrow=TRUE)