Consider the following relations:

$\left(1\right) \mathrm{A}-\mathrm{B}=\mathrm{A}-\left(\mathrm{A}\cap \mathrm{B}\right)$

$\left(2\right) \mathrm{A}=\left(\mathrm{A}\cap \mathrm{B}\right)\cup \left(\mathrm{A}-\mathrm{B}\right)$

$\left(3\right) \mathrm{A}-(\mathrm{B}\cup \mathrm{C})=\left(\mathrm{A}-\mathrm{B}\right)\cup \left(\mathrm{A}-\mathrm{C}\right)$

Which of these is/are correct

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