Which one among the following plains is associated with Limestone Topo

Which one among the following plains is associated with Limestone Topography ?

Bajada plain
Alluvial plain
Karst plain
Pene plain
This question was previously asked in
UPSC CAPF – 2015
Limestone topography is also known as Karst topography. It is a landscape formed from the dissolution of soluble rocks, such as limestone, dolomite, and gypsum. Characteristics of karst topography include sinkholes (dolines), caves, underground drainage systems, and the absence of surface rivers or lakes over large areas. A plain developed in such a region would be termed a Karst plain, often featuring numerous sinkholes or other dissolution features.
Karst landscapes are specifically associated with the chemical weathering (dissolution) of soluble bedrock, most commonly limestone.
Bajada plains are formed by the coalescing of several alluvial fans along the base of a mountain front in arid or semi-arid regions. Alluvial plains are level landform areas built by deposition of sediment by rivers. Peneplains are low-relief plains that form over long periods as a result of erosion wearing down highlands, often approaching a base level. None of these are primarily defined by limestone dissolution processes.
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