Answer:
Option B Software as a Service
Explanation:
Software as a Service (SaaS) is a new software acquisition model. SaaS is based on a subscription license instead of perpetual license. The software is hosted by software provider and the user is required to use a client software or web browser to access and use the software. User pays for the service (software itself) they use on regular basis which can be monthly or yearly.
SaaS offers always up-to-date software solution to the user and the software can be accessed from any machine at any place. Apart from the subscription fee, user is not required to pay additional cost for license renewal or updating software. SaaS provides a cheaper and economic cost of software acquisition.