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(a) on disk.
(b) on disk, CDROM and the Internet.
(c) on disk and CDROM.
(d) on disk and the Internet
You can store them where you like , even in "the cloud"
(b) on disk, CDROM and the Internet.
I will go with option (b) on disk, CDROM and the Internet
B) is my answer and I also agree with Mr. Kinsbergen
Cad blocks can be stored both on disk and the internet storage sites.