An online library wants to introduce a feature where an email notification is generated whenever a
book becomes available for circulation. This notification must be sent to only those members who
have expressed interest in that book.
Which design pattern would you use to implement this requirement?
A.
Observer
B.
Payload Extractor
C.
Asynchronous Resource Integrator
D.
Web Service Broker
E.
Service Starter
A
A
A
A