Answer:
Option B, C, D are correct.
Step-by-step explanation:
Isosceles triangle is a triangle in which two sides are equal in length.
Scalene : Scalene is a triangle in which all sides are unequal.
Right : In this triangle any two sides may be equal in length.
Acute : In this triangle any two sides may be equal in length.
Obtuse : In this triangle any two sides may be equal in length.
Therefore, Option B, C, D are correct.