A: Hi alex722,

if you just have one business/brand you want to advertise, and you're not an agency working with many clients, then Tier 1 is an excellent choice for you. :-) It includes all the channels.

A sub-account can be used by agencies to onboard new client accounts under their master account, or you can use sub-accounts if you own multiple brands, domains or subsidiaries.

Best Regards,
Carl-Wilhelm