Which two configurations are necessary to enable password-less SSH login to an IOS router? (Choose two.)

Which two configurations are necessary to enable password-less SSH login to an IOS router? (Choose two.)
A . Enter a copy of the administrator’s public key within the SSH key-chain
B . Enter a copy of the administrator’s private key within the SSH key-chain
C . Generate a 512-bit RSA key to enable SSH on the router
D . Generate an RSA key of at least 768 bits to enable SSH on the router
E . Generate a 512-bit ECDSA key to enable SSH on the router
F . Generate a ECDSA key of at least 768 bits to enable SSH on the router

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Answer: A,D