A coordination compound $CrC{l}_3*4H_{2}O$ gives a white precipitate of AgCl with $AgN{O}_3.$ The molar conductance of the compound corresponds to two ions. The structural formula of the compound is

Select one:

a$.[Cr(H_{2}O{)}_{4}Cl]C{l}_2$

b$.[Cr(H_{2}O{)}_{4}C{l}_2]Cl$

c$.Cr(H_{2}O{)}_{4}C{l}_3$

d$.[Cr(H_{2}O{)}_{3}C{l}_3]H_{2}O$