The correct answer for a peripediment in a desert or semi-desert region is option 4 - Playa.

1. Inselberg: This term refers to a prominent isolated hill or mountain that rises abruptly from a surrounding plain. Inselbergs are typically composed of hard rocks that resist erosion.

2. Zeugen: Zeugen are also rock formations, but they are characterized by the presence of parallel ridges and valleys. These formations are created due to differential erosion of layers of rock.

3. Bajada: Bajada refers to a broad slope or apron of debris extending from the base of a mountain range. Bajadas are formed by the accumulation of sediment eroded from the mountains and deposited onto the lower regions.

4. Playa: A playa is a flat, dry lakebed or basin that is typically found in arid or semi-arid regions. Playas are created when water evaporates from a shallow depression, leaving behind a flat surface covered with sediment.

In this case, the correct answer is Playa as it best fits the description of a peripediment in a desert or semi-desert region.