Originally Posted by
hvogt
The term 'cloud base' in the answer given as the correct one is slightly misleading as the definition of CAVOK does not refer to any cloud base. However, the conditions for CAVOK are not met since (1.) there are clouds below 1 500 metres (5 000 ft) or below the highest minimum sector altitude, whichever is greater, and (2.) there is towering cumulus.
TCU was one of the options, but it was marked as incorrect, which threw me further.
I guess the examiner was thinking along the same lines as Negan.
I got this from the BGS bank, but I didn't take note of the question ID.