Which three constraints and pain-points should an integration architect consider when choosing the integration pattern/mechanism?

A customer is migrating from an old legacy system to Salesforce. As part of the modernization effort, they would like to integrate al existing systems that currently work with their legacy application with Salesforce.

Which three constraints and pain-points should an integration architect consider when choosing the integration pattern/mechanism? Choose 3 answers
A . System types – APIs, File systems, Email
B. Reporting and usability requirements
C. Multi-language and multi-currency requirement
D. Error handling mechanisms
E. Data Volume and Processing volume

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Answer: A,D,E