Determine which of the following systems of equations is in row-echelon form. System I: 
System II: 
System III: 
A) None of the systems are in row-echelon form.
B) Only system II is in row-echelon form.
C) Only systems II and III are in row-echelon form.
D) All systems are in row-echelon form.
E) Only systems I and III are in row-echelon form.
Correct Answer:
Verified
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