In what way does Google’s phone call conversion tracking feature track calls to an advertiser’s account?

Question

Accepted Answer

It tracks calls via a dynamically created Google forwarding number.

Answer

It tracks calls via the assigned Google Click Identifier (GCLID) set up in the advertiser’s account.

Answer

It tracks calls via the conversion name for the advertiser’s store.

Answer

It tracks calls via the phone number listed on the advertiser’s official store website.