Which cloud service model should they consider to quickly develop this solution?

A bricks-and-mortar electronics retailer wants to increase sales by selling products through an online portal in addition stores. To achieve this, they have assembled a team of software developers to build the online portal and the selling capability.

Which cloud service model should they consider to quickly develop this solution?
A . PaaS
B . IaaS
C . SaaS
D . BaaS

Answer: A