Consider the historical demands from week $1$ to week $9$ as $154,178,189,220,235,256,289,301,$ and $312,$ respectively. What is the initial trend and level to use for Holt$$s method $($Hint: use Excel$)?$

a$.$

L$0=134,$ T$0=32\mathrm{.}4$

b$.$

L$0=154,$ T$0=20\mathrm{.}6$

c$.$

L$0=134,$ T$0=20\mathrm{.}6$

d$.$

L$0=112,$ T$0=19\mathrm{.}5$