$(3$ points$)$ Question $3$: The following regular expression describes what language?

$($You may assume the alphabet of the language contains the symbols $\text{'}$O$\text{'}$ and $\text{'}1\text{'}.)$

$02+1$

a$.)$

b$.)$

$.)$

d$.)$

e$.)$

f$.)$

g$.)$

h$.)$

All strings that contain exactly one $0$ and exactly one $1$

All strings that contain at least one $0$ and at least one $1$

All strings that start with a $0$ and end with a $1$

All strings of length at least $2$ that start with a $0$ and end with a $1$

All strings of length $3$ that start with a $0$ and end with a $1$

All strings of length at least $3$ that start with a $0$ and end with a $1$

All strings over the alphabet $\{0,1\}$

All strings of positive length over the alphabet $\{0,1\}$