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Thanks for the reply. I read the License Terms PDF before posting my question on the forum. I am asking here because I am unclear about the term "viewers." Contacting Customer Care led me to the forum as there is no phone support offered.
In this case "viewers" applies when the Work is incorporated into a television program, video or other production. It would not apply to a physical banner that is viewed by people passing the construction site, so a Standard license would be fine.