In the following,which interaction is indicated by $+/-$?

Match the Column-$I$ with Column-$II$:

Column-$I$	Column-$II$
$(a)$ Parasitism	$(i)$ $++$
$(b)$ Commensalism	$(ii)$ $+-$
$(c)$ Amensalism	$(iii)$ $0+$
$(d)$ Mutualism	$(iv)$ $0-$

Interspecific interaction could be

Cattle or goats are never seen browsing on $Calotropis$ growing in abandoned fields because of the presence of:

Biological control methods adopted in agricultural pest control are an example of which interaction?

Given below are two statements.
Statement $I$: $Calotropis$ growing in abandoned fields is never consumed by cattle and goats.
Statement $II$: $Calotropis$ produces highly poisonous cardiac glycosides.
In light of above statements,select the most appropriate answer from the option given below.