Sam works as a Database Administrator for Gentech Inc. The company is using Oracle 11g as the database server. Sam wants to protect the company’s data by encrypting the physical data files created on the operating system. Which of the following types of encryption should he use to accomplish the task?
A. Transparent Data Encryption (TDE) for securefiles
B. Transparent Data Encryption (TDE) for tablespace
C. Network encryption
D. Transparent Data Encryption (TDE) for column