Which forecasting method is used to compute the sales forecast given in TABLE $1?$

$(2$ points$)$

a$)$ Expo with alpha $=0\mathrm{.}1$ and initial forecast $-=10$

b$)3$ months Weighted MAM with weights $0\mathrm{.}3,0\mathrm{.}2,0\mathrm{.}5$

c$)3$ month moving average method

d$)$ averaging method

TABLE $1$

Month Actual Demand Forecast

Jan $13$

Feb $14$

Mar $10$

Apr $1812\mathrm{.}33$

May $1314$

Jun $13\mathrm{.}67$