Match Column-I with Column-ll and select the correct option from the codes given below. $\begin{array}{ll}\text { Column-I } & \text { Column-II }\end{array}$
A. Ecology
(i) Relationships of organisms and environment
B. Herbarium
(ii) Original specimen cited by an author
C. Holotype
(iii) A hierarchial unit
D. Taxon
(iv) Collection of wild and domestic plants
(a) $\mathrm{A}-(\mathrm{i}), \mathrm{B}-(\mathrm{ii}), \mathrm{C}-(\mathrm{iii}), \mathrm{D}$-(iv)
(b) $\mathrm{A}-(i), \mathrm{B}-(i i), \mathrm{C}-(\mathrm{iv}), \mathrm{D}$-(iii)
(c) $\mathrm{A}-(i), \mathrm{B}-(\mathrm{iv}), \mathrm{C}-(\mathrm{ii}), \mathrm{D}-($ iii $)$
(d) $\mathrm{A}-(\mathrm{iv}), \mathrm{B}-(\mathrm{ii}), \mathrm{C} \cdot(\mathrm{iii}), \mathrm{D}-(\mathrm{i})$