a) If the oxidation potential of a redox enzyme is +0.2V, identify the compound from the following list that suit best a

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a)
If the oxidation potential of a redox enzyme is +0.2V, identify
the compound from the following list that suit best as mediator for
transferring the electron from the redox centre of the enzyme to
the eletrode: (a) +0.1V; (b), +0.2V; (c), +0.3V; (d), 0.0V; (e),
-0.1; (f), - 0.2V; (g), -0.3V.
b)
Define (through description and not through figure/scheme)
following involved in the surface plasmon resonance spectroscopy
:(a) Surface plasmons and (b) Polariton? (c) Evanescent wave