What is the primary function of a moving average (MA) in stock market analysis?

Which of the following statements accurately describes the relationship between moving average period length and its responsiveness to price changes?

How does the exponential moving average (EMA) differ from the simple moving average (SMA)?

In the context of moving averages, what does a 'crossover' signify?

According to the 200-day moving average strategy, what does it indicate if a stock price is consistently above its 200-day MA?