Select all the terms that are part of the canonical Product of Sums for the following 3-variable function: f(a,b,c) = II M (1,2,4, 6) (a'+b'+c') (a+b+c) (a+b'+c) (a+b+c) (a'+b+c) (a+b+c) (a'+b+c) (a'+b+c)