เฉลยแนวข้อสอบ Google AdWords Fundamentals – What’s one of the main benefits of using ad extensions?

เฉลยแนวข้อสอบ Google AdWords Fundamentals –
100. What’s one of the main benefits of using ad extensions?

a) Extension ensure a higher clickthrough rate (CTR) because they make your ad more prominent
b) Extension provide additional information to make your ads more relevant to customers
c) Extension increase your reach by showing your ad on more advertising networks
d) Extension are automated so you don’t have to create your ads