Which of the following description about unknown joint rotation is correct?
A.
The number of the unknown joint rotation is less than the number of the rigid joint of a structure.
B.
The number of the unknown joint rotation is equal to the number of the rigid joint of a structure.
C.
In general, we will have one unknown joint rotation for each rigid joint of a structure.
D.
In general, we will have one unknown joint rotation for each joint of a structure.