Answer:
The correct options are 1 and 2.
Explanation:
Given information: Triangle QST is isosceles, and bisects T.
In triangle QRT and SRT,
(common side)
(Bisector)
(Isosceles triangle)
By SAS rule,

(CPCTC)
Bisector of an isosceles triangle is the altitude of triangle.

Therefore options 1 and 2 are correct.