John used to work as a Network Administrator for We-are-secure Inc. Now he has resigned from the company for personal reasons. He wants to send out some secret information of the company. To do so, he

Email spoofing involves forging email header fields (such as From or Reply-To) to make a message appear to originate from a different sender, not hiding data inside image files.

Social engineering involves manipulating people through psychological tactics to obtain information or access, not technically concealing data within files.

Steganography hides the existence of a message by embedding it within an innocuous carrier file - in this case, an image of a celebrity. Unlike encryption which makes data unreadable, steganography makes the hidden data invisible to inspection, which is why the mail server's content filters could not detect the exfiltrated information. Tools like 'image hide' automate this embedding process at the bit level.

Web ripping refers to copying or downloading the full content of a website, which is entirely unrelated to hiding data inside image files.