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We derive the off-shell nilpotent and absolutely anticommuting (anti-)BRSTsymmetry transformations corresponding to the local time-reparametrizationsymmetry transformation of the $(0+1)$-dimensional (1D) diffeomorphism (i.e.time-reparameterization) invariant FRLW model within the framework ofsupervariable approach BRST formalism. An application of (super-)diffeomorphisminvariance yields horizontality conditions. The celebrated CF-type of conditionwhich emerges as an off-shoot of the horizontality condition provides theabsolute anticommutativity of the (anti-)BRST transformations. In addition,this CF-type condition is required for the derivation of coupled (butequivalent) Lagrangians. We also capture the (anti-)BRST invariance of theLagrangians in terms of the Grassmannian translational generators andsupervariables.

(Anti-)BRST Symmetries in FLRW Model: Supervariable Approach