What are three characteristics of modular switches? (Choose three.)
A.
The power supply, fan, and line cards can be replaced.
B.
Only the line cards have more than one backup unit.
C.
Modular switches can be upgraded simply by adding new line cards or supervisor engines.
D.
Modular switches can only be upgraded by adding new line cards.
E.
Modular switches have three parts: the power supply, the fan, and individual module cards.
F.
Modular switches have four parts: the chassis and backplane, the power supply, the fan, and individual module cards.