Leila would like to know what the difference is between a strike, lock$-$out and protest action.

$4\mathrm{.}1$ Provide a discussion differentiating between a strike and protest action. $(20$ Marks$)$

$4\mathrm{.}2$ Provide Leila with a definition and explanation of what a lock$-$out constitutes. In your answer, explain the

pre$-$requisites for the existence of a lock$-$out.