ECL was invented in Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â by

ECL was invented in Â Â Â Â Â Â Â Â Â Â Â Â �

1.	ECL was invented in Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â by
A.	1956, baker clamp
B.	1976, james r. biard
C.	1956, hannon s. yourke
D.	1976, yourke
Answer» D. 1976, yourke