Which standard includes versions such as 802.11a and 802.11b?

The correct answer is associated with standards that govern the operation of wireless networks, specifically the IEEE 802.11 family of standards. This family includes various versions like 802.11a and 802.11b, which define the specifications for wireless local area networking (WLAN).

802.11a operates on the 5 GHz band and offers higher data rates, while 802.11b operates at 2.4 GHz and was one of the first widely adopted wireless standards. Both standards establish how wireless devices communicate over the air, including aspects like frequency, modulation, and signal integrity, which is why they fall under the category of wireless communication standards.

The other options do not accurately encompass the specific subject matter. Network protocols are more general and encompass a range of communication techniques used within networks—not exclusively wireless. Data transmission protocols could be too broad, as they can include wired communication methods as well. Sound communication protocols pertain to audio transmission standards and are unrelated to wireless networking. Thus, the choice of wireless communication standards is clearly the most relevant in this context.