Identify the chiral carbons in the given organic compound.

both a and b

The correct answer is option 3. both a and b.

The chiral carbon are marked with and asterix (*).

Chiral Centre:

A chiral centre is an atom that has four different groups bonded to it in such a manner that it has a non-superimposable mirror image. The term "chiral centre" has been replaced by the term chirality centre. In the molecule below, the carbon atom is a chirality centre.