We can tell how an amino acid will be classified (as…

We can tell how an amino acid will be classified (as…

We can tell how an amino acid will be classified (as polar or non-polar) by looking at it to see whether 

1) it has a hydrocarbon chain or ring in its R-group; this will make it insoluble in water (and thus non-polar).

2) it has a charge (- or +) in its amino group; this will make it non-polar.

3) it has an electronegative atom (like oxygen) in its carboxyl group; this will classify it as polar.

4) it has a charge (- or +) in its R-group; this will make it polar. 
Additional Requirements 

Level of Detail: Only answer needed 
Other Requirements: There could be more than one correct answer(it is ok), it a multiple choice (choose all) question