Four types of chemical messengers (Black Dots) released from the regulator cell (R) to the target cell (T) are depicted in I, II, III and IV

Match I, II, III and IV sequentially with (i) Steroid Hormone, (ii) Pheromones, (iii) Neurohormone iv) Neurotransmitter and choose the correct option. 

(a) iv, iii, ii, i 

(b) iv, iii, i, ii 

(c) i, ii, iii, iv 

(d) iii, iv, i, ii

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