Question: The following table shows the encryption / decryption keys of Alice and Bob. Alice Bob Symmetric key Ks Public key Kpua Kpub Private key Kpra

The following table shows the encryption/decryption keys of Alice and Bob.
Alice
Bob
Symmetric key
Ks
Public key
Kpua
Kpub
Private key
Kpra
Kprb
Alice wants to send a message to Bob in a confidential message. For the confidentiality purpose the message should be encrypted with which key?
Kprb
Kpra
OKs

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