Which of the following statements is not true about neurotransmitters?

Which of the following statements is not true about neurotransmitters?
a) Neurotransmitters are released by nerves.
b) Neurotransmitters are required to carry a ‘message’ from a nerve to a target cell.
c) Neurotransmitters have significant distances to cover to reach their target cells.
d) Neurotransmitters bind to receptors on target cells.