Which of the following is a hexadentate ligand?

The correct answer is Option (3) → Ethylenediaminetetraacetate ion

NCERT (2026-27 edition):
5.2 Definitions of Some Important Terms Pertaining to Coordination Compounds – “… Ethylenediaminetetraacetate ion (EDTA^4–) is an important hexadentate ligand. It can bind through two nitrogen and four oxygen atoms to a central metal ion.”