Which of the following are true regarding technical analysis?

1. When MACD crosses above its signal line, one should buy the stock.

2. When width of Bollinger Bands of a stock has stayed relatively narrow, one should expect that the volatility of the stock will increase.

3. Using RSI to sell when it is above 70 and buy when it is below 30 is a mean reversion strategy.

A. Only 1

B. Only 2

C. 1 and 2 are true

D. 2 and 3 are true

E. All of the above