Match column $-I$ and column $-II$ with the correct relation:

Column $-I$	Column $-II$
$(i)$ Dumas method	$(a)$ Absorption of $NH_3$ in $H_2SO_4$
$(ii)$ Kjeldahl's method	$(b)$ $BaCl_2$ by added $BaSO_4$
$(iii)$ Carius method	$(c)$ Mixture of Magnesia
$(iv)$ Estimation of phosphorus	$(d)$ $N_2$

(A) The correct matches are as follows:
$(i)$ Dumas method is used for the estimation of nitrogen gas $(N_2)$.
$(ii)$ Kjeldahl's method involves the absorption of ammonia $(NH_3)$ in sulfuric acid $(H_2SO_4)$.
$(iii)$ Carius method is used for the estimation of halogens,where the precipitate is formed using $BaCl_2$ or $AgNO_3$ (specifically for sulfur,$BaSO_4$ is formed).
$(iv)$ Estimation of phosphorus is done by precipitating it as magnesium ammonium phosphate using a mixture of magnesia.
Therefore,the correct sequence is $(i-d), (ii-a), (iii-b), (iv-c)$.