The app builder should recommend building a global action to create Contacts. A global action allows users to create records quickly from any page in Salesforce on their mobile devices. The app builder can also specify predefined values for some fields in the global action, such as Account Name or Phone Number, to make data entry easier for users. Option A is incorrect because customizing the mobile menu to move Contacts to the top does not help users create new contacts quickly or follow up later. Option C is incorrect because adding a compact layout to Contacts does not help users create new contacts quickly or follow up later, but rather shows them more fields on record detail pages or list views. Option D is incorrect because using Path and setting pre-defined values does not help users create new contacts quickly or follow up later, but rather guides them through different stages of a record.