The input x(t) and the output y(t) of a continuous-time system are related as:\(y\left( t \right) = \mathop \smallint \limits_{t - T}^t x\left( u \right)du\)The system is:

• A. linear and time-variant
• B. linear and time-invariant
• C. non-linear and time-variant
• D. non-linear and time-invariant