Cameron has worked as an engineer at Festivus Engineering $("$Festivus$")$ for thirty$-$five years. The firm replaced him with Lucy who is only $24-$years old and willing to work for $40\%$ less than Cameron's salary. The firm never offered to let him stay for less pay. When he left, one of the partners told him, "Honestly, it's not a bad thing to now have a beautiful young lady working with the clients." Which of the following statement is true?

Festivus is liable, because it had an obligation to offer Cameron the lower salary before firing him.

Festivus is liable, because age was a factor in Cameron's firing.

Festivus is liable, because it is illegal to replace an older worker with a younger one just to save money.

Festivus is not liable, because age was not the deciding factor in Cameron's firing.