Which of these moves are tenuki?
White plays A. Black can play B if he wishes.
White aims to exchange B–C and then retreat to A.
White aims to exchange C–B and then play A.
White aims to exchange D for a move around Δ.
White simply takes a big point with E.
There’s no question that A is a local move and E is a tenuki. In all cases except the immediate A, Black is given the option of pincering White on the right side; however, only B and C are relevant to the following fight, and B more so.
I don’t think White can claim that D is sente – if Black wants to ignore it and play on the right, he will (and, ofc, Black can resist with a more active move at C6).
I’d refer to A as a local move, D and E as tenuki, and B and C and “semi-tenuki”, with C being more of a tenuki than B.
Humble 5k opinion.