A String Fixed at Both Ends Is Vibrating in One

Multiple Choice

A string fixed at both ends is vibrating in one of its harmonics. If we now increase only the frequency at which the string is vibrating, which of the following characteristics do we also
Increase? (There could be more than one correct choice.)

A) the amplitude of the traveling waves on the string
B) the wavelength of the traveling waves on the string
C) the period of the traveling waves on the string
D) the speed of the traveling waves on the string
E) none of the above