Which of the following is right about the long run risk of buy and hold a stock for many years versus short$-$term investment in a stock

Buy and hold for $30$ years is more risky than holding a stock for just one year because return is compounded over time and risk is increasing in holding horizon

Buy and hold involves lower total risk then holding a stock for just one year because of time diversification. So it might be less worrisome to stick to buy$-$and$-$hold for the longer term as Warren Buffett does.

Buy and hold a stock for $30$ years has the same risk as the risk of holding a stock for one year

Buy and hold a stock for thirty years is always a safer choice on average than holding a stock for one year.