Which integration solution should the architect consider when planning the implementation?

A large enterprise customer operating in a high regulated industry is planning to implement

Salesforce for customer facing associates in both Sales and Service, and back office staff.

The business processes that Salesforce supports are critical to the business.

Salesforce will be integrated to multiple back office systems to provide a single interface for associates. Reliability and monitoring of these integrations is required as associates support customers.

Which integration solution should the architect consider when planning the implementation?
A . Architect Services in back office systems to support callouts from Salesforce and build reliability, monitoring and reporting capabilities.
B. Decouple back office system callouts into separate distinct services that have inbuilt error logging and monitoring frameworks.
C. Build a custom integration gateway to support back office system integrations and ensure reliability and monitoring capabilities.
D. Leverage Middleware for all back office system integrations ensuring real time alerting, monitoring and reporting capabilities.

Answer: D