A. Damp Proof Material
B. Damp Proof Mix
C. Damp Proof Member
D. Damp Proof Membrane
I had been asked this question during an internship interview.
I need to ask this question from Damp Proofing in chapter Building Construction of Basic Civil Engineering
To elaborate: DPM is a membrane material applied to prevent dampness. It can be used for a DPC (Damp Proof Course). An example is laying a polyethylene sheet under concrete slabs.