a$)[3$ point $]$

Let us start by considering a simple nested loop join. Compute the IO cost for a simple

nested loop join if R is the "outer loop" and S is the "inner loop."

b$)[3$ point $]$

Compute the IO cost for a simple nested loop join if S is the "outer loop" and R is the

"inner loop."

c$)[8$ points $]$

Now consider using a block nested loop join. Compute the IO cost for joining R$,$ S and then joining the result with T $.$ Then compute the IO cost for joining S$,$T and then joining the result with R$.$