Which statement correctly describes Cisco WAAS?

Which statement correctly describes Cisco WAAS?

A.
Cisco WAAS Mobile has the same features as Cisco WAAS and differs only in performance.

B.
Cisco WAAS Express is integrated into Cisco IOS.

C.
Cisco yWAAS can be implemented on any Cisco ISR routers.

D.
Cisco WAAS Express can run simultaneously with Cisco Unity Express on the same Cisco SRE.