How many tables and how many foreign keys are needed to implement an REA data model that has six distinct entities,

one $M$:$N$ relationships, and five $1$:$N$ relationships, and one $1$:$1$ relationship in a relational database?

a$.11$ tables & $2$ foreign keys

b$.7$ tables & $6$ foreign keys

c$.8$ tables & $5$ foreign keys

d$.6$ tables &$7$ foreign keys