$($ii$)$ Determine the computational complexity of the algorithm referenced in part a$($i$)$ above. Show all steps in your working. $[2$ marks$]($b$)($i$)$ The Divide$-$and$-$Conquer $($DaC$)$ algorithm for the multiplication of two n digit numbers is outlined in Appendix D$.$ Use this algorithm to compute C$=73$ x $26.[3$ marks$]($ii$)$ Outline how the algorithm may be used to multiply two $4-$digit numbers eg $1634$ by $3156.[$Note: The product is not required, only a description of how the product will be obtained$].[2$ marks$]$