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The input  $x(t)$ and the output  $y(t)$ of a continuous –time system are related as $$y(t)=\int_{t-T}^{t}x(u) du.$$ The system is

  1. linear and time-variant
  2. linear and time-invariant
  3. non-linear and time-variant
  4. non-linear and time-invariant
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