12. (Refer to Figure 20, area 5.) The CAUTION box denotes what hazard to aircraft?

12. (Refer to Figure 20, area 5.) The CAUTION box denotes what hazard to aircraft?

Unmarked balloon on cable to 3,008 feet MSL.
Unmarked balloon on cable to 3,008 feet AGL.
Unmarked blimp hangars at 300 feet MSL.

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