Paula Springer was recently hired as a dental assistant at Yoply Dental Associates. During her lunch break, she heard two other dental assistants sharing how they both had been working there for two years, with the same education, skill set, and years' experience, yet they have a twenty$-$five cent pay difference in their hourly pay. If this is a true statement, which act would this be violating?

a$.$ The Equal Pay Act of $1963$

b$.$ The Age Discrimination in Employment Act $($ADEA$)$ of $1957$

c$.$ Title VII, Civil Rights Act

d$.$ The Americans with Disabilities Act $($ADEA$)$ of $1990$