Consider the relation $R=\{A,B,C,D,E,F,G,H,$I,$J\}$ and the set of functional dependencies $F=\{\{A,B\}\{C\},\{A\}\{D,E\},\{B\}\{F\},\{F\}\{G,H\},\{D\}\{I,J\}\}.$ What is the key for $R?$ Decompose $R$ into $2NF$ and then $3$ NF Relations. Hint: The key attribute for a relation is the attribute$($s$)$ that can determine all of the other attribute values.