Question 1[5 X 2 =10 points) A B D 1 20 M 101 N 21 N 102 3 3 22 O 103 1 21 M 104 3 3 22 O 101 Find out which of the following dependencies are valid or not. For each dependency, briefly write the reasons. 1. A-> BD 2. A->C 3. AB ->D 4. D -> ABC 5. BC -> A