How many LED‚Äö√Ñ√∂‚àö√ë‚àö¬•s are used in Pulse oximeter probe?$

How many LED‚Äö√Ñ√∂‚àö√ë‚àö¬•s are used in Pu

1.	How many LED‚Äö√Ñ√∂‚àö√ë‚àö¬•s are used in Pulse oximeter probe?$
A.	1
B.	2
C.	3
D.	4
Answer» C. 3