Find values of the parameters ( a ), ( b ), and ( c ) so that ( a cos(bx) + c ) has a minimum value of 4, a maximum value of 8, and a period of 7. Specify the location of at least one maximum and one minimum.
a) ( a = 2, b = /{π}/{7}, c = 6 )
b) ( a = 3, b = /{2π}/{7}, c = 5 )
c) ( a = 4, b = /{3π}/{7}, c = 4 )
d) ( a = 1, b = /{π}/{7}, c = 7 )