This system can be costly and time consuming if not computerized.
A)Perpetual
B)Periodic

Perpetual

Continuing indefinitely without interruption; in accounting, it often refers to systems that continuously update inventory or records.

Inventory System

A method or system used to plan, organize, and control the goods or materials that are held in stock, ensuring efficient management and use of inventory.

Costly

Involving high expenses; describing something that requires significant financial outlay.