Shannon Sampling Theorem

What condition is required for Shannon's sampling theorem to accurately reconstruct an analog signal from discrete sample points?

Hint
The Nyquist sampling, or Nyquist-Shannon theorem is a fundamental theoretical principle that governs the design of mix signal systems.
The Nyquist sampling, or Nyquist-Shannon theorem is a fundamental theoretical principle that governs the design of mix signal systems. If a system uniformly samples an analog signal at a rate that exceeds the signal's highest frequency by at least a factor of 2, the original analog signal can be accurately reconstructed from the discrete sample points. In other words:
$$$fs>2fN$$$
$$$fs>2fN$$$