Which of the following events is involved in the transfer of information across a chemical synapse?(i) Neurotransmitters bind to the postsynaptic receptors.(ii)Calcium channels open in the presynaptic region.(iii) Ion channels open in the postsynaptic membrane.(iv) Direct flow of ions from one neuron to the next.

Options

A. (i) and (ii) only
B. (i),(ii) and (iii) only
C. (ii),(iii) and (iv) only
D. All of these