for testing network elements which of the below is TRUE
a)Thorough understanding of RFC s/ IETF standards is enough.
b)One has to know design specifications along with standards and specification.
c)Understanding customer requirements is required for acceptance test only and not for system/functional testing.
d)One has to know design specifications along with standards and customer requirements.
e)Network Testing is subjective and depends on interpretation of Specs and inplementation