Are automatically generated _______ that can serve with search ads. They're optimized to direct consumers to relevant pages contextually on your website. Available in one- and two-line formats, they look the same as advertiser-provided sitelink extensions. Between two and six ___________ can show with a specific ad, but this depends on the customer's device at the time.
a) Callout extensions
b) Sitelink extensions
c) Promotion extensions
d) Location extensions