What is the difference between reach and impressions in Facebook advertising

What is the difference between reach and impressions in Facebook advertising?

a) Reach measures the total number of times an ad is displayed; impressions measure unique users reached

b) Reach measures unique users reached; impressions measure the total number of times an ad is displayed

c) Reach and impressions are the same thing

d) Reach measures engagement; impressions measure visibility

Answer : b) Reach measures unique users reached; impressions measure the total number of times an ad is displayed

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