Indicate whether the following matrices in their current form are 'Upper Triangular', 'Lower Triangular', or 'Neither'

$[[2,0,1]]$

$3$

$-$vv$[[3,2,3,0,6,4,2]]$

$1$

$1$

$[[1,2,3,2,1,0,4]]$

$0$

$0$

$[[1,0,0,0,2,0,3]]$

$4$

$0$

A$.$ Lower Triangular

B$.$ Neither

C$.$ Upper Triangular