I have a question about a residential garage that I am building. My family is having a detached garage built on our property. It is far from our main house but close to an electrical pole. We plan to have new service delivered to the garage. The foundation is concrete block. My question is, what type of cable can be run in the garage that will be secured to the concrete block walls? I will not be installing studs or drywall in the garage. A quick web search told me that I would need to use BX cable. I checked the 2017 NEC, but it was unclear as to exactly what is allowed to be used. I figured it was either BX or to run conduit, but there was nothing I found that said Romex was not allowed. Can you please clarify this for me?