How can you confirm the formation of the product by interpreting the ¹H NMR spectrum for the product using chemical shift, number of hydrogens peaks, and multiplicity of each peak?

a) By observing the chemical shift and number of peaks
b) By observing the chemical shift and multiplicity
c) By observing the number of peaks and multiplicity
d) By observing all three factors: chemical shift, number of peaks, and multiplicity