Which of the following statements is CORRECT?

Question $2$ options:

$1)$

The slope of the Security Market Line is beta.

$2)$

Any stock with a negative beta must in theory have a negative required rate of return, provided rRF is positive.

$3)$

If a stock's beta doubles, its required rate of return must also double.

$4)$

If a stock's returns are negatively correlated with returns on most other stocks, the stock's beta will be negative.

$5)$

If a stock has a beta of to $1\mathrm{.}0,$ its required rate of return will be unaffected by changes in the market risk premium.