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Which of the following statements are $CORRECT$?

- For a rheopectic fluid, the apparent viscosity increase with time under a constant applied shear stress
- For a pseudoplastic fluid, the apparent viscosity decreases with time under a constant applied shear stress
- For a Bingham plastic, the apparent viscosity increases exponentially with the deformation rate
- For a dilatant fluid, the apparent viscosity increase with increasing deformation rate

- $P$ and $Q$ only
- $Q$ and $R$ only
- $R$ and $S$ only
- $P$ and $S$ only