Data leakage of sensitive information is MOST often concealed by which of the following?

SSL encrypts traffic between client and server, which is the same mechanism attackers exploit to conceal data leakage - malicious outbound data blends into legitimate encrypted HTTPS traffic, bypassing traditional deep packet inspection. Because the payload is encrypted, network monitoring tools cannot easily detect sensitive data being exfiltrated without SSL/TLS inspection capabilities. This makes SSL the most common method used to conceal data leakage.

SHA is a cryptographic hashing algorithm used for data integrity verification, not for encrypting or concealing data transmissions, so it cannot be used to hide exfiltrated data in transit.

WEP is a deprecated and easily cracked wireless encryption protocol that applies only to Wi-Fi network segments and is not used as a general mechanism to conceal data leakage over the internet.

Secure POP (POP3S) is a specific email retrieval protocol secured with TLS, and while it uses encryption, it is a narrow-use protocol not broadly used to conceal general data exfiltration the way SSL/TLS traffic is.