SSH - SSH or (Secure Shell) is a protocol that enables two computers to communicate securely by encrypting the connection. Since the question is looking to transfer files over the internet to a specific directory, the FTP protocol can be used for the file transfer itself. As SSH can be used with the FTP protocol, this allows for secure(SSH) file transfer(FTP) over the internet.
S/MIME (Secure/Multipurpose internet Mail Extensions) - Digitally signs and encrypts the contents of email messages.
LDAPS(Lightweight Directory Access Protocol) - Provides authentication for directory-based traffic.
SRTP (Secure Real-time Transport Protocol) - Provides authentication/encryption for transmitted audio and video traffic.

Explanation
A turnstile is a physical security control that regulates the entry and exit of people into a facility or an area. It can prevent unauthorized access, tailgating, etc., by requiring valid credentials or tokens to pass through

Explanation
The security engineer is an example of a data custodian. A data custodian is a person who is responsible for implementing and maintaining the security controls for the data, such as encryption, backup, access control, etc. A data custodian acts on behalf of the data owner, who is the person who has the authority and accountability for the data. A data controller is a person who determines the purposes and means of processing the data, such as a company or an organization. A data processor is a person who processes the data on behalf of the data controller, such as a service provider or a vendor1.