Introduction to R Following is a preview of the matrix mat: 1.1] 1.2] [3] [4] [1.] 21 25 29 33 [2,1 22 26 30 34 [3,] 23 27 31 35 [4.] 24 28 32 36 What is the output of this code? mat[3:4, 1:3] SELECT THE OUTPUT [1,1 [2.] 1.1] [12] 2933 30 34 (1.) [2.] 1,1) 1,2] 2933 31 35 (1.) [2,1 1.1) 1,2) 1,3) 23 27 31 24 28 32 Save time with our keyboard shortcuts