a$)$ Insert data item $56$ into the tree and draw the resulting B$+$ tree.

$($Note that the height of the tree will increase after the insertion.$)$

b$)$ Delete data item $29$ in the original tree $($the above figure$)$ and

draw the resulting B$+$ tree. $($The height of the tree should not

change after the deletion.$)$Given the following $B+$ tree $(M=3,L=3)$ :