Using a combination of symmetric and asymmetric key encryption, Sofia sent a report to her home office in Indiana. She received an e$-$mail acknowledgement that her report had been received, but a few minutes later she received a second e$-$mail that contained a different hash total than the one associated with her report. This most likely explanation for this result is that

the private key had been compromised.

the asymmetric encryption key had been compromised.

the symmetric encryption key had been compromised.

the public key had been compromised.