When and who discovered that more than one transistor could be constructed on a single piece of semiconductor material:

When and who discovered that more than one transistor could be constru

1.	When and who discovered that more than one transistor could be constructed on a single piece of semiconductor material:
A.	1949, William Schockley
B.	1955, Walter Bratten
C.	1959, Robert Noyce
D.	1960, John Bardeen
Answer» D. 1960, John Bardeen