Which of the following application is suitable for FIFO Queue ?

• A. An inventory of parts is to be processed by part number
• B. A dictionary of words used by a spelling checker id to be created
• C. A program to solve a maze is to back track to an earlier position when a dead end position is reached
• D. A program to keep track of patients as the check into clinic, assigning them to doctors a first come, first served basis