Question: Suppose that we read a csv file called 'mpg' into R.The file has 6 variables and 150 rows.Which of the following is the correct command

Suppose that we read a csv file called 'mpg' into R.The file has 6 variables and 150 rows.Which of the following is the correct command to use in R if we would like to print out the first 6 rows of columns 1, 2 and 3 ?

a.acct[1-6,3]

b.acct[1:6,1:3]

c.acct[1:3,1:6]

d.acct[1-6,1,2,3]

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