How many statements are correct about components?

0 1 2 3 4

Statement 1. A time series is the value of a business variable over time. Statement 2. Stationarity is the overall nature of a time series. Statement 3. A component is a cause of variability within a time series. Statement 4. Variability in a time series can be due to patterns observed within a time series or outside causal factors that influence the time series or both.