Which of the following pairs is not correctly matched?

PYQ UPPSC LT Grade (Assistant Teacher) 2025

1. A.

   limₓ→π/2 (sin x)^(tan x) : 0

2. B.

   limₓ→0 (aˣ−bˣ)/x : log(a/b)

3. C.

   limₓ→0 x log x : 0

4. D.

   limₓ→π/2 (sec x−tan x) : 0

Attempted by 9 students.