Joseph has $$100$$ mice. Each of them is either white or grey. At least one of the mice is grey, and out of any seven of Joseph\textquotesingle s mice at least four are white. How many grey mice does Joseph have at the most? 
选项为:A:$$1$$  B:$$3$$  C:$$93$$  D:$$97$$  E:$$99$$  请回答其中一个选项.