Final answer:
AES-256 is the strongest encryption technique among the given options; it is widely used for securing sensitive data globally.
Step-by-step explanation:
The question asks which option employs the strongest encryption technique. The answer is AES-256, which stands for Advanced Encryption Standard with a 256-bit key length. AES-256 is widely recognized as a very robust encryption method and is used by governments and industries around the world to protect sensitive information.
In contrast, options like ROT13 and Base64 are not encryption methods but rather simple encoding schemes that do not provide real security. The term 'Text' is too ambiguous to be considered an encryption technique.