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A delayed unit step function is defined as text u left(...

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Transform Theory
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A delayed unit step function is defined as \[{\text{u}}\left( {{\text{t}} - {\text{a}}} \right) = \left\{ {\begin{array}{*{20}{c}} {0,}&{{\text{for t}} < {\text{a}}} \\ {1,}&{{\text{for t}} \geqslant {\text{a}}} \end{array}} \right..\]      Its Laplace transform is

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Correct Answer: Option D
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