Which of the following is one of the approved anemometers?

The approved anemometer listed in the choices is the DIC - 3. This device is recognized for its accuracy and reliability in measuring wind speed and direction, making it suitable for various applications, including parachuting operations. The DIC - 3 has been tested and validated in the field, adhering to the standards set for safety and usability in airborne environments. This certification and validation ensure that data collected using this system is trustworthy, which is crucial for jumpmasters who rely on precise wind readings for planning safe jumps.

The other options, while potentially valid instruments in different contexts, may not meet the specific approval standards required for parachuting operations, which emphasizes the accuracy and dependability of the instruments used during jumps.