(a) In the 2010 case Gasses v. City of Riverdale, the Supreme Court of Georgia indicated that an ordinance under constitutional attack carries with it a presumption of what? (b) Only when what is established will a statute be declared unconstitutional? (c) The Court further indicated that a municipal ordinance is a valid exercise of the police power if it is “substantially related” to what? (Link to case may be found in Content section.)