As Project Manager for a shopping center development, you are faced with various situations to deal with. Which one of the following is not aligned in any way with the term Scope Creep?

The builder uses cheaper and less experienced labor than that expected causing more work and the schedule to slip

The project is on schedule but the architect continues to insist on small design improvements which somehow get incorporated

A labor strike took place, which was feared from the beginning

A better concrete mix was identified which costs more, but it$$s been determined that the benefits outweigh the additional costs