(3)AnsweringEachInterrogatory.Eachinterrogatorymust,totheextentitisnotobjectedto,beansweredseparatelyandfullyinwritingunderoath.(4)Objections.Thegroundsforobjectingtoaninterrogatorymustbestatedwithspecificity.Anygroundnotstatedinatimelyobjectioniswaivedunlessthecourt,forgoodcause,excusesthefailure....