When there is a need for immunity to EMI for connecting locations that are greater than 100 meters apart, which two solutions can be utilized? (Choose two.)

When there is a need for immunity to EMI for connecting locations that are greater than 100 meters apart, which two solutions can be utilized? (Choose two.)
A . multimode fiber
B . Fibre Channel
C . HVDC transmission lines
D . single-mode fiber
E . serial RS-232
F . Gigabit Ethernet 1000BASE-CX

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Answer: A,D