When comparing costs for the outsourcing decision, compare $\_\_\_\_\_\_\_\_\_\_\_\_\_\_$ for the best results.

a$.$ Price vs internal cost to make

b$.$ Landed cost versus cost to make including freight

c$.$ Cost to make less fixed costs remaining after outsourcing versus price

d$.$ Cost to make less fixed costs remaining after outsourcing versus TCO

e$.$ All of the above are good indicators

f$.$ None of the above

c$.$ The total cost of ownership of buying a part from a specific supplier

d$.$ All of the above

e$.$ Only a and b

f$.$ None of the above