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The polydispersity index (PDI) of a polymer is:
\( \left(\bar{M}_{\mathrm{w}}=\right. \) weight average molecular mass and \( \bar{M}_{n}= \) number average molecular mass).
(a) The product of \( \overline{\mathrm{M}}_{\mathrm{w}} \) and \( \overline{\mathrm{M}}_{\mathrm{n}} \)
(b) The sum of \( \overline{\mathrm{M}}_{\mathrm{w}} \) and \( \overline{\mathrm{M}}_{\mathrm{n}} \)
(c) The difference between \( \overline{\mathrm{M}}_{\mathrm{w}} \) and \( \overline{\mathrm{M}}_{\mathrm{n}} \)
(d) The ratio betwen \( \overline{\mathrm{M}}_{\mathrm{w}} \) and \( \overline{\mathrm{M}}_{\mathrm{n}} \)
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