Which of the following relationships must be true according to the laws of series and parallel connections? (include in your answer only relationships that must be true according to the laws of series and parallel connections, not those that are true in this problem only because of the particular resistances given.)

check all that apply.
a. δv1= δv2δv3δv4
b. δv2= δv3δv4
c. δv3=δv4
d. δv1=δv2
e. δv2= δv1δv3δv4
f.δv2=δv3
g. δv1= δv3δv4