​Which of the Following Statements Is/are True of Ligands

​Which of the following statements is/are true of ligands?
1) A ligand is a molecule or an ion having a lone pair of electrons that can be donated to the metal ion to form a covalent bond.2. A complex ion is a charged species consisting of a metal ion surrounded by ligands.​
3) The number of ligands attached to a metal ion is called the coordination number.

A) 1 only​
B) 2 only
C) 1 and 2
D) 1 and 3
E) 1, 2, and 3