f(x) = {\(\frac{|x|}{x}\) for x≠0 and 0 for x=0}. Which function is this?

f(x) = {\(\frac{|x|}{x}\) for x≠0 and 0 for x=0}. Which function is

1.	f(x) = {\(\frac{\|x\|}{x}\) for x≠0 and 0 for x=0}. Which function is this?
A.	Constant
B.	Modulus
C.	Identity
D.	Signum function
Answer» E.