Using the data set below, what would be the forecast for period $4$ using a three period moving average: $($Choose the closest answer.$)$

Period Actual Demand

$110,000$

$212,400$

$313,250$

$415,750$

$520,500$

$618,500$

a$.12,244$

b$.11,500$

c$.14,008$

d$.11,883$

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