A system exhibiting S.H.M. must possess

Elasticity as well as inertia
Elasticity, inertia and an external force
Elasticity only
Inertia only
Elasticity as well as inertia  Basic conditions to execute simple harmonic motion are: (i) There must be an elastic restoring force acting on the system, (ii) the system must have inertia, and (iii) the acceleration of the system should be directly proportional to its displacement and is always directed to mean position.

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