The correct answer is A.
OBJ-2.1: DES is outdated and should not be used for any modern applications. The AES, RSA, and ECC are all current secure alternatives that could be used with OpenSSL. This question may seem beyond the scope of the exam. Still, the objectives allow for “other examples of technologies, processes, or tasks about each objective may also be included on the exam although not listed or covered” in the objectives’ bulletized lists. The content examples listed in the objectives are meant to clarify the test objectives and should not be construed as a comprehensive listing of this examination’s content. Therefore, questions like this are fair game on test day. That said, your goal isn’t to score 100% on the exam; it is to pass it. Don’t let questions like this throw you off on test day. If you aren’t sure, take your best guess and move on!