Which of the following statements are CORRECT?

P$.$ For a rheopectic fluid, the apparent viscosity increases with time under a constant applied shear stress

Q$.$ For a pseudoplastic fluid, the apparent viscosity decreases with time under a constant appliedshear stress

R$.$ For a Bingham plastic, the apparent viscosity increases exponentially with the deformation rate

S$.$ For a dilatant fluid, the apparent viscosity increases with increasing deformation rate

$($A$)$ P and Q only

$($B$)$ Q and R only

$($C$)$ R and S only

$($A$)$ P and S only