You are designing a solution that needs to support 30 IP phone users. Which switch model and how many switches does the Cisco Single-Site Secure Network Foundation1.1 Desing and Implementation Guide suggest for the solution?()
A、A.1 Catalyst Express 500G-12TC,1 Catalyst 3750G-12S-S
B、B.1 Catalyst 3750G-12S-S,1 Catalyst Express 500-24PC
C、C.2 Catalyst Express 500G-12TC
D、D.2 Catalyst 3750G-12S-S,1 Catalyst Express 500-24PC
E、E.2 Catalyst Express 500-24PC
F、F.2 Catalyst 3750G-12S-S