Can you explain this type of problem. How would I get the answer for this?? I just want to understand how this works to be able to solve this types of questions.

Q$5$: Suppose we have a table $R$ with six attributes: $\{A,B,C,D,E,F,G\},$

and a set $FD=\{ABC,BG,BC,AGEF,EA,D$ABE$\}.$

Answer the following questions?

What is $B{D}^{+}?$

What is $E^{+}?$