Question

1. a mechanical fastener used on your robot, that is meant to be more permanent than a screw is

a wrench
b nut
c rivet
d allen key
e screw/bolt

Explanation:

A wrench is a tool, not a fastener. A nut is used with a bolt and can be removed easily. An allen - key is a tool. A screw/bolt can be removed. A rivet is a permanent fastener as it deforms during installation and is difficult to remove without damage.

Answer:

C. rivet