Final answer:
The protected tree of Nepal is all of them - Sal, okhar (Bark), and Bijaya sali.
Step-by-step explanation:
The protected tree of Nepal is all of them (i) Sal, (ii) okhar (Bark), and (iii) Bijaya sali.
Sal is a type of hardwood tree commonly found in the Terai region of Nepal. It is known for its economic and ecological importance, and its wood is used for various purposes.
Okhar (Bark) refers to the bark of the Chir Pine tree, which is also protected in Nepal. The bark is used for various purposes including medicinal and industrial applications.
Bijaya sali is another protected tree species in Nepal. It is commonly found in the Terai and Siwalik regions, and its wood is used for timber, construction, and furniture making.