In a Cisco SD-Access solution, what is the role of the Identity Services Engine?

In a Cisco SD-Access solution, what is the role of the Identity Services Engine?
A . It provides GUI management and abstraction via apps that share context.
B . It is leveraged for dynamic endpoint to group mapping and policy definition.
C . It is used to analyze endpoint to app flows and monitor fabric status.
D . It manages the LISP EID database.

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Answer: B