1. Question 1 Are the following relations in BCNF? 3NF?. If R is not in 3NF, decompose it to 3NF: 1. R(XYZT): XYT->Z, ZT->X, XZ->Y, XZ->T 2. R(XYZT): XY->Z, XYT->Z, XYZ->T, XZ->T 3. R(XYZT): YT->Z, XY->T, XZ->Y, YT->X 4. R(XYZT): YZ->X, XT->Z, ZT->Y, YT->Z 5. R(ABCD): AB ->C, C -> D, D->A