Which of the following statements is correct?
a. If an equation is dimensionally correct it must be true and if an equation is not dimensionally correct it cannot be true.
b. If an equation is dimensionally correct it may be true and if an equation is not dimensionally correct it may be true.
c. If an equation is dimensionally correct it must be true and if it is not dimensionally correct it may be true.
d. If an equation is dimensionally correct it may be true and if it is not dimensionally correct then it cannot be true.