The greatest possible length which can be used to measure exactly the length 5m ,2m 19cm, 4m 20 cm is?	Choose the most appropriate option.
A) 25cm	B) 1cm	C) 56cm	D) 42cm	E) 35cm
Required length = H.C.F of 500cm, 219cm, 420cm = 1cm   Answer is 1cm
<result>B</result>
The greatest possible length which can be used to measure exactly the length 5m ,2m 19cm, 4m 20 cm is?