Which of the following statements are true regarding exponential smoothing and moving averages?
a.Moving averages uses past values of a time series and exponential smoothing uses future values of a time series.
b.Trend and seasonality can be present in the time series.
c.Moving averages looks at values for n number of periods and exponential smoothing looks at values for all periods.
d.Exponential smoothing gives more weight to the older observation and less weight to the recent observation.