A put option on $100$ shares of Generous Dynamics stock has an exercise price $$65\mathrm{.}0$ per share. GD declares $10-$for$-1$ stock split. What happens to the exercise price and the number of shares underlying the option?

Number of shares is reduced to $10\mathrm{.}0$ and the exercise price is increase to $650\mathrm{.}0$

Number of shares increases to $1000\mathrm{.}0$ and the exercise price is reduced to $6\mathrm{.}5$

Number of shares increases to $1000\mathrm{.}0$ and the exercise price remains the same

Nothing happens