Column I		Column II
a	charge on electron (magnitude)	p	$1.6022\times {10}^{-19}\mathrm{C}$
b	$\mathrm{e}/{\mathrm{m}}_{\mathrm{e}}$	q	$1.758820\times {10}^{11}{\mathrm{Ckg}}^{-1}$
c	Mass of proton, $m_p$	r	$1.00867\mathrm{u}$
d	Mass of neutron, $m_n$	s	$1.00727\mathrm{u}$
		t	$4.8\times {10}^{-10}\mathrm{esu}$

Choose the correct option:

1. (a-p, t); (b-q); (c-s): (d-r)
2. (a-q, t); (b-r); (c-s): (d-s)
3. (a-p, t); (b-s); (c-p): (d-r)
4. (a-p, t); (b-q); (c-p): (d-r,s)