How are ketones named?

The carbonyl group (C=O) is located on a secondary carbon in ketones.
They can be named by functional group nomenclature or by substitution.
In the functional group nomenclature, the radicals attached to the carbonyl group are named alphabetically followed by the word 'ketone'.
In the substitution nomenclature, they are named as a derivative of the hydrocarbon by substituting a -CH2- for a -CO-, with the ending '-one' and its corresponding locator number.
a) Statements 1, 2 and 3 are correct.
b) Statements 1, 2 and 4 are correct.
c) Statements 1, 3 and 4 are correct.
d) All statements are correct.