In a VPC, can you modify a set of DHCP options after you create them?

A.
Yes, you can modify a set of DHCP options within 48 hours after creation and there are no VPCs
associated with them.

B.
Yes, you can modify a set of DHCP options any time after you create them.

C.
No, you can’t modify a set of DHCP options after you create them.

D.
Yes, you can modify a set of DHCP options within 24 hours after creation.

Explanation:
After you create a set of DHCP options, you can’t modify them. If you want your VPC to use a
different set of DHCP options, you must create a new set and associate them with your VPC. You
can also set up your VPC to use no DHCP options at all.
http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_DHCP_Options.html