Determine the minimal SOP and POS forms for the following Boolean expressions using Karnaugh maps.

a. f(a,b,c) = ab'c' + abc' + a'b'c'

b. g(a,b,c,d) = (a'+b'+c+d)(a'+b+c+d')(a+b'+c+d)(a+b+c+d')(a+b+c+d')

c. h(w,x,y,z) = wx'y'z' + w'xy'z + wx'yz' + wxy'z' + wx'y'z + w'xy'z'

d. j(w,x,y,z) = wyz + wxyz + wxz + wxz + wxyz