Let R be a commutative Noetherian ring, and let M be a finitely generated R-module. a) Prove that every submodule of M is finitely generated. Utilize the Noetherian property of R in your proof. b) Define what it means for M to be injective and projective. Provide necessary and sufficient conditions for M to possess these properties within the category of R-modules. c) Explore the category of finitely generated R-modules by proving that it has enough projectives and injectives. Describe explicit constructions of projective and injective modules in this category. d) Investigate the Hom and Tensor functors by proving the adjointness between them. Provide detailed proofs of the natural isomorphism between HomŔ(POR M, N) and HomŔ(P, HomŔ(M, N)) for suitable modules P, M, N. e) Apply the Snake Lemma to a specific commutative diagram of R-modules and homomorphisms. Provide the diagram, execute the proof, and explain the resulting exact sequence.