A storage retrieval machine (SRM) consists of a load handler, a mast, and a __________.

• A. Base
• B. Drive system
• C. Controller
• D. Carriage

Answer: (D)

The key idea is how an SRM moves and positions a load. The mast provides vertical reach, and the load handler does the actual grabbing and releasing. The piece that carries the load handler along the mast to the correct horizontal position is the carriage. It slides up and down the mast’s length, enabling precise placement at any shelf level while the mast handles vertical motion. The base, drive system, and controller are important parts of the overall system, but the component that completes the basic SRM structure with the load handler and mast is the carriage.