Describe the term related to storage system (a) Bay (b)stack (c) Multi tier bins (d) Racks?

I fully agree with the answers been added by EXPERTS...............Thanks.

sorry i'm not expert on this filed

Bay - area in front of loading & unloading dock

Stack - Block of stock / arranged goods

Bins - is a common term for drum / bucket used to keep some thing - record / scap

Racks - iron block to keep the stock