With no explanation, chose the best option from "A", "B", "C" or "D". are differences between sanctions under Rule 37(a) and substitution of counsel conditioned on payment of fees, the parallel considerations convince us that the Cunningham rationale applies here. Like Rule 37(a) sanctions, the present situation invokes concerns regarding finality, avoiding piecemeal appeals, and availability of effective appellate review.” Id. Cases from the First, Second, Third, and Fifth Circuits further support interpreting Cunningham as applying more broadly than to Rule 37(a) sanctions alone. The First Circuit recognized in Empresas Omajede, Inc. v. Bennazar-Zequeira, 213 F.3d 6, 9 n. 4 (1st Cir.2000), that Cunningham affirmed its precedents denying interlocutory appeals in the sanctions area. See, e.g., United States v. Kouri-Perez, 187 F.3d 1, 14 (1st Cir.1999) (<HOLDING>); Appeal of Licht & Semonoff 796 F.2d 564, 573

A: holding such denial to be an immediately appealable collateral final order
B: holding district courts order postponing ruling on defendants qualified immunity defense was immediately appealable
C: holding sanctions order pursuant to district courts inherent powers not immediately appealable
D: holding sanctions pursuant to rule 26g not immediately appealable
C.