Which protocol do e-mail programs use to identify the file types of attached files?

Answer is MIME protocol.

Multipurpose Internet Mail Extensions lets clients use this protocol to share and exchange different kinds of data files like audio, video, images, and other kinds by extending the limited capabilities of email. Basically, this protocol describes the content type of the message and the type of encoding used.

Solution: the categorization of functional and non-functional requirement are as follows: some of the more typical functional requirements include: • business rules• transaction corrections, adjustments and cancellations• administrative functions• authentication• authorization levels• audit tracking• external interfaces• certification requirements• reporting requirements• historical data• legal or regulatory requirementswhile,some typical non-functional requirements are: • performance – for example response time, throughput, utilization, static volumetric• scalability• capacity• availability• reliability• recoverability• maintainability• serviceability• security• regulatory• manageability• environmental• data integrity• usability• interoperability

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