What is Denticity ?

Question

$\begin{array}{1 1} \text{(a)Denticity refers to the number of acceptor groups in a single ligand that bind to a central atom in a coordination complex.} \\ \text{(b)Denticity refers to the number of donor groups in a single ligand that bind to a central atom in a coordination complex.} \\ \text{(c)Denticity refers to the number of donor groups in a multiple ligand that bind to a central atom in a coordination complex.} \\ \text{(d) Denticity refers to the number of acceptor groups in a multiple ligand that bind to a central atom in a coordination complex.}\end{array}$