A company wants to forecast demand using the simple moving average. They have sales data for the last three years i$.$e$.$ for $2017,2018$ and $2019.$ How would they forecast $2020$ sales?

Create a model using linear regression from data available

Use a weighted average with more weight to $2019$ sales, second most to $2018$ and least to $2017$ sales

Forecast for $2020$ would be an average of the last three years sales.

Ask experts to look at the past sales data and use their judgement to predict sales