What should Analisa implement in her online store to solve this problem?

Analisa has noticed that although her company takes many orders online, very few customers rerun to place additional orders. She investigates, and learns that customer order delivery is taking a very long time. What should Analisa implement in her online store to solve this problem?

A.
An improved shopping cart module

B.
An improved secure transaction processing module

C.
An improved product catalog module

D.
An improved fulfilment tracking module