If ( r(t) = i + tj + 2t²k ), then select all of the following that are true.1. ( r(1) = i + j + 2k )₂. ( r'(t) = j + 4tk )₃. ( r''(t) = 4k ) 4. ( lVert r(t) rVert = t² )
a) 1 and 2
b) 2 and 3
c) 3 and 4
d) 1, 2, and 4