The correct name for the complex ion [CoCl(ONO)(en)2]+ is :
a. chlorobis(ethylenediamine)nitrito-O-cobaltate (III) ion
b. chlorodiethyldiaminenitrito-O-cobalt (III) ion
c. chloronitrito-O-diethyldiamine cobaltate (III) ion
d. chlorobis(ethylenediamine)nitrito-O-cobalt (III) ion