【单选题】
A lic boolean is ExistsIndex（String indexName）（ Indi ces Exi stsResponse respo aDmin Cl i ent 0. prepare Exi sts（indexName）. get（
B public boolean is ExistsIndex（String indexName）（ Indi cesExists Response response getAdmin ClientO. prepare Exi sts（indexName）: return esponse. isExistso true: false:
C public boolean i sExistsIndex（String indexName）（ Indi cesExists Response response= getAdmin Client（ geto: return response is ExistsO? true false.
D public boolean i sExistsIndex（String indexName）（ Indi cesExists Response response= getAdmi ncClientO. prepare Exists（indexName）, getO: return response. isExists0? true: false:
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