please answer the question within 30 minutes in detailed manner. make sure the answer and reasons are explained in details else i will give negative ratings for sure.

Lena, an engineer, worked for a construction company for 4 years when he was terminated without cause. The amount of pay he received was strictly following the Employment Standards Code. The employer stated that it did not owe him any more pay in lieu under the common law because, according to the employment contract's termination clause, it only had to meet the minimum requirements of the provincial employment standards statute. The contract termination clause read: "Termination notice must be in writing from the Manager, and professional staff will receive one month '5 notice...and/or as established by Iegis/ation.' ! What are Lena's arguments that the termination clause is invalid? If Lena sues for wrongful dismissal, how will the courts determine the common law reasonable noce