The CORRECT statement regarding the substitution of coordinated ligands in $\mathrm{Ni}(\mathrm{CO})_{4}$ and $\mathrm{Co}(\mathrm{NO})(\mathrm{CO})_{3}$ is: (Given: $\mathrm{Co}-\mathrm{N}-\mathrm{O}$ bond is nearly linear; atomic numbers of Co and Ni are 27 and 28 , respectively)
(a)$\mathrm{Ni}(\mathrm{CO})_{4}$ and $\mathrm{Co}(\mathrm{NO})(\mathrm{CO})_{3}$ follow associative and dissociative pathways, respectively.
(b)Both $\mathrm{Ni}(\mathrm{CO})_{4}$ and $\mathrm{Co}(\mathrm{NO})(\mathrm{CO})_{3}$ follow associative pathway.
(c)Both $\mathrm{Ni}(\mathrm{CO})_{4}$ and $\mathrm{Co}(\mathrm{NO})(\mathrm{CO})_{3}$ follow dissociative pathway.
(d)$\mathrm{Ni}(\mathrm{CO})_{4}$ and $\mathrm{Co}(\mathrm{NO})(\mathrm{CO})_{3}$ follow dissociative and associative pathways, respectively.