Which of the following graphs are trees? (Tree or Not A Tree) 1. A graph G with V(G)={a,b,c,d,e} and E(G)={{a,b},{a,c},{d,e}} (Tree or Not A Tree) 2.  A graph G with V(G)={a,b,c,d,e} and E(G)={{a,b},{b,c},{c,d},{d,e}} (Tree or Not A Tree) 3. A graph G with V(G)={a,b,c,d,e} and E(G)={{a,b},{a,c},{b,c},{c,d},{d,e}} (Tree or Not A Tree) 4. A graph G with V(G)={a,b,c,d,e} and E(G)={{a,b},{a,e},{b,c},{c,d},{d,e}}

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