Final answer:
CAT6 cable is the correct option for speeds over 800Mbps compared to DB-9, coaxial, and CAT5e.
Therefore, the correct answer is: option c).CAT6
Step-by-step explanation:
Category 6 cable (Cat 6) is a standardized twisted pair cable for Ethernet and other network physical layers that is backward compatible with the Category 5/5e and Category 3 cable standards. The rating for cables with speeds over 800Mbps among the options provided is CAT6.
The DB-9 connector is not a cable but a type of serial connector, whereas coaxial cable has its use but is typically not rated for such high data speeds in comparison to modern twisted-pair cable standards.
CAT5e can achieve up to 1 Gbps under optimal conditions, but it is not rated for speeds over 800Mbps as reliably as CAT6.
The CAT6 cable is designed to handle speeds up to 10 Gbps over shorter distances and is the correct choice for such high-speed requirements.