AND$=$&$,OR=+,$NOT$=!,$xOR$=$@$.$

Primary input variables are available in both uncomplemented and complemented forms.

Do not consider the number of transistors.

No Fan$-$in limit$.$

Suppose that numbers from $10[1010]$ to $15[1111]$ never appear.

$[$END$]$ Which form $($SOP vs$.$ POS$)$ has a lower cost?

Select one:

a$.$ SOP

b$.$ POS

c$.$ EQUAL