Proper and Improper subset

Q. If $A=\{x:-2\le x<2,x\in Z\}$, then the number of proper subsets of $A$ is

1. $14$
2. $15$
3. $16$
4. $31$

Q. If $A=\{x:-2\le x<2,x\in Z\}$, then the number of proper subsets of $A$ is

1. $14$
2. $15$
3. $16$
4. $31$

Q.

When is $A$ called proper subset of $B$ ?

1. $A\subset B,A\ne B$

2. $A\subset B,A=B$

3. $A\in B$

4. $B\in A$