Step 1: Understand the correct spelling of the word.
The correct word is \textit{liaison}, which means a connection or communication between two or more people or groups. It is often used in the context of cooperation or coordination.
Step 2: Check the other options.
LAIESON, LASION, LASSION — all of these are incorrect spellings of the word.
LIAISON — correct.
Step 3: Conclusion.
The correctly spelled word is \textit{liaison}, which is the only option that is recognized in standard English usage.