$($a$)$ Using the MATLAB function NURBS$\_1$D$,$ plot all of the B$-$spline basis functions of polynomial

degree p $=2$ associated with the knot vector $\backslash$Xi $=[0$; $0$; $0$; $1$; $2$; $2$; $3$; $4$; $5$; $5$; $6$; $6$; $6].$

$($b$)$ Using the MATLAB function NURBS$\_2$D$,$ plot two representative B$-$spline basis functions of

polynomial degree p$1=$ p$2=2$ associated with the knot vectors $\backslash$Xi $1=[0$; $0$; $0$; $1$; $2$; $2$; $3$; $4$; $4$; $4]$ and

$\backslash$Xi $2=[0$; $0$; $0$; $1$; $2$; $2$; $2]$