Which configuration enables sampling, assuming that NetFlow is already configured and running on the router’s fa0/0 interface?

A network engineer is asked to configure NetFlow to sample one of every 100 packets on a router’s fa0/0 interface. Which configuration enables sampling, assuming that NetFlow is already configured and running on the router’s fa0/0 interface?
A. flow-sampler-map flow1
mode random one-out-of 100
interface fas0/0
flow-sampler flow1
B. flow monitor flow1
mode random one-out-of 100
interface fas0/0
ip flow monitor flow1
C. flow-sampler-map flow1
one-out-of 100
interface fas0/0
flow-sampler flow1
D. ip flow-export source fas0/0 one-out-of 100