A Very Long String Is Tied to a Rigid Wall

Multiple Choice

A very long string is tied to a rigid wall at one end while the other end is attached to a simple harmonic oscillator. Which of the following can be changed by changing the frequency of the oscillator?

A) The speed of the waves travelling along the string.
B) The tension in the string.
C) The wavelength of the waves on the string.
D) All of the above.
E) None of the above.