Variables

Which statement$($s$)$ is$/$are true?

char can be used to store all possible letter grades for students in a class

A variable name can start with a number

If you convert the double value $1\mathrm{.}99$ to an int you will get $1$

Var$\_1$ and var$\_1$ are different variable names

You can declare multiple variables with the same name if they are different types

You can change the name of a variable after you have declared it