An unknown with MF C_3H_7NO_3 has the following spectral data: IR Spectrum: Bonds observed are O-H, C = O, and primary amine N-H bands ^1H NMR: (ppm, splitting pattern, integration value) 2.5 ppm, singlet, 2H 2.8 ppm, singlet, 1H 3.2 ppm, triplet (or doublet of doublets), 1H 3.3 ppm, triplet (or doublet of doublets), 1H 4.ppm, triplet1H 112 ppm, singlet, 1H ^13C NMR: (a) Calculate HDI: show work. (c) Indicate each type of carbon in the table above (C, CH, CH_2 or CH_3). (d) Draw the skeletal structure of this unknown. Please give only one answer in the box below.