Question $2)$ Solve the following recursion relations by using the unfolding method

$($substitution method$)$

a$)T(n)=T(n-1)+1,T(0)=1$

b$)T(n)=T(n-1)+n,T(0)=1$

c$)T(n)=T(n-1)+logn,T(0)=1$

d$)T(n)=2T(\frac{n}{2})+n,T(1)=1$

e$)T(n)=2^{n}T(n-1),T(0)=1$