What code for returns true if the string s has no periods? Choices are listed as XXX / YYY / ZZZ. bool HasNoPeriods(string s) { int ; bool noPeriods XxX; for . length () if . at YYY; else { ZZZ; } return noPeriods; bool HasNoPeriods(string s) { int ; bool noPeriods XXX; for . length () if } YYY; else { ZZZ; } } return noPeriods; } true noPeriods false (nothing false noPeriods true (nothing (nothing) noPeriods false noPeriods true (nothing) noPeriods true noPeriods false