An internal forecast is based on$\_\_\_\_\_\_\_\_.$

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Part $1$

A$.$

the prediction of a$$ firm's sales over a given period through surveys sent to financial analysts

B$.$

the relationships between a$$ firm's sales and certain economic indicators

C$.$

a$$ buildup, or$$ consensus, of sales forecasts through a$$ firm's own sales$$ channels, adjusted for additional factors such as production capabilities

D$.$

developing the pro forma income statement to forecast sales and then express the various income statement items as percentage of projected sales