Identify the structure of the polymer 'P' formed in the given reaction

Caprolactam $\xrightarrow[\mathrm{H}_2 \mathrm{O}]{533-543 \mathrm{~K}} P$

The monomer which is present in both bakelite and melamine polymers is

Match the following.

List-I (Monomer/s)	List-II (Name of polymer)
A. CF₂$=$CF₂	I. Neoprene
B. NH₂(CH₂)₆NH₂, HO₂C(CH₂)₄CO₂H	II. Bakelite
C. C₆H₅OH₃ HCHO	III. Teflon
D. CH₂$=$CH(Cl)—CH$=$CH₂	IV. Nylon 6,6

The correct answer is

Amongst the following, how many of them come under the category of elastomers? Natural rubber, polyethene, vulcanized rubber, bakelite, polyvinylchloride, buna-N, nylon-6, neoprene