$4$a$.(6$ points$)$ It is possible for a symmetric relationship to be one$-$to$-$many, and if

that is the case, under what conditions will it be true? $($Note: A symmetric

relationship is one which is its own inverse.$)$

$4$b$.(6$ points$)$ Consider a n$-$way relationship R between entity sets E$1,$ E$2,...,$ En

$,$ where $($n $>3).$ Three of the entity sets are weak entities. What is the minimum

and maximum number of attributes that could form the key for a relation

derived from R$?$