Which of the following is most useful for helping to keep an electronic message confidential until it reaches the intended receiver? a$.$ Have the sender encrypt data with his$/$her private key, then have the receiver decrypt data with the sender$\text{'}$s public key b$.$ Have the sender encrypt data with his$/$her public keythen have the receiver decrypt data with his$/$her own private key. Have the sender encrypt data with the receiver's public key, then have the receiver decrypt data with his$/$her own private key $.$ d $.$ Have the sender encrypt data with the receiver's private keythen have the receiver decrypt data his$/$her own public key $.$ e $.$ None of the above methods would help keep the electronic message confidential