Which of the statements are examples of signaling? Choose all that apply. There is more than one correct answer.

A name$-$brand bleach is priced $45\%$ higher per gallon than the generic alternative.

Jo decides to go to graduate school so her future employer will know that she is smart and a hard worker.

Haley uses her $4\mathrm{.}0$ grade point average to land a new job.

Tommy's Tea Shop advertises by recording the testimonials of satisfied customers.

Fred's Used Cars offers a warranty on every car sold.