Which of the following on a highway tractor I- or C-channel frame rail is vertical?

A) flange
B) web
C) gusset
D) all of the above

C-Channel Frame Rail

A structural component in vehicles or machinery, shaped like the letter 'C', providing support and rigidity.

Flange

A flat rim, collar, or rib, typically projecting for strength or attachment to another object, as at the end of a pipe, steam cylinder, etc.

Gusset

A triangular piece of metal used to reinforce or strengthen a joint in structures or in components like bicycle frames.