How would the attacker use netcat to encrypt the information before transmitting onto the wire?

An attacker runs netcat tool to transfer a secret file between two hosts.

He is worried about information being sniffed on the network.

How would the attacker use netcat to encrypt the information before transmitting onto the wire?
A . Machine A: netcat -l -p -s password 1234 < testfileMachine B: netcat <machine A IP> 1234
B . Machine A: netcat -l -e magickey -p 1234 < testfileMachine B: netcat <machine A IP> 1234
C . Machine A: netcat -l -p 1234 < testfile -pw passwordMachine B: netcat <machine A IP> 1234 -pw password
D . Use cryptcat instead of netcat

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Answer: D