What are the functions of the skeleton

question 8 options:

a)
a. support

b)
b. protection

c)
c. movement

d)
d. all of the above

i think its d

The real advantage to hydrostatic weighing is that it a. can be done anywhere with no equipment b. gives one of the most accurate measurements of body fat c. uses calipers to measure body fat select the best answer from the choices provided.