How are ethers named?

Ethers are compounds that result from the union of two alkyl or aromatic radicals through an oxygen bridge (-O-).
They can be named by substitution or by functional group nomenclature.
In the functional group nomenclature, the two radicals are named in alphabetical order followed by the word 'ether'.
When the ether is not the main function, it is named as '-oxy', indicating the 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.