AcompanyisplanningtoimplementaB2Cstoreandwouldliketorecommendproductstoitscustomersaccordingtotheirpersonalinformation（forexample：age，gender，maritalstatus）.WhichWebSphereCommerceV5.6function/featurecouldbeusedtoimplementthisrequirement？（）
A.giftcertificates
B.marketingcampaigns
C.merchandisingassociations
D.loyaltyprograms