Problem $4(10$ Points$)$:

Assume relations R$($A$,$B$,$ C$)$ and S$($C$,$D$,$ E$)$ with the following properties. R has $20,000$ tuples and $25$ tuples fit in

a block. S has $45,000$ tuples and $30$ tuples fit in a block. How many block accesses are required to form the join $R$

${}_S$ using the Block nested$-$loop join when $3$ memory blocks are available.Please include all the mathematical

steps to compute your final answer for this question. No point is given if only the answer is provided.