A travelling wave 400/1/50 means crest value of
400 V With rise time of 1/50 s
400 kV with rise time 1 s and fall time 50 s
400 kV with rise time
400 MV with rise time
400 kV with rise time
A travelling wave 400/1/50
means crest value of 400 kV with rise time 
Hence, the correct option is
(C).
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