Given the DC characteristics of two logic families A and B, calculate the low noise margin (NML) for B -> A (output of B connected to input of A)
a. NML = VI(B) - VO(A)
b. NML = VO(A) - VI(B)
c. NML = VO(B) - VI(A)
d. NML = VI(A) - VO(B)