First let us create an even split of the data into train and test partitions using createDataPartition. The code with a missing line is given below: set. seed(2)
# line of code
test <- iris[test_index,]
train <- iris[-test_index,]

Which code should be used in place of # line of code above?

a. test_index <- createDataPartition(y, times=1,p=0.5)
b. test_index <- sample(2,length(y),replace=FALSE) c. test_index <- createDataPartition(y, times=1,p=0.5,list=FALSE)
d. test_index <- rep(1,length(y))