Use the $23$ tree below to answer a$)$ to d$)(5$ points$)$

a$)$ The in$-$order predecessor of node $A$ is node:

b$)$ The in$-$order successor of node A is node: I

c$)$ The in$-$order predecessor of node B is node: $K$

d$)$ The in$-$order successor of node B is node:

e$)$ The largest node that is less than node L is:Please explain how to get these answers? I don't understand how these ansers came to be$?$