Please point out two key CISCO competitors in the SMB market? (Choose two

Small and medium enterprises (also SMEs, small and medium businesses, SMBs, and variations thereof) are companies whose headcount or turnover falls below certain limits. Please point out two key CISCO competitors in the SMB market? (Choose two.)

A.
HuaWei

B.
Microsoft

C.
Nortel

D.
Avaya