To prevent authenticated external users from searching for Quote and Contract objects but not Opportunity or Asset objects, you need to remove Opportunity and Asset from the object list in the Global Search Result component property editor and the Autocomplete object list in the Search component property editor. The Global Search Result component displays the search results for all objects that match the search term. The Autocomplete object list displays the suggested objects that match the search term as you type. You can customize these components by selecting or deselecting the objects that you want to include or exclude from the search.

Three items that are reportable by a site administrator through Google Analytics for Experience Cloud sites are B, C, and E. Google Analytics is a tool that allows you to measure and analyze the traffic and behavior of your Experience Cloud site visitors. Google Analytics can report on various items, such as:
Search Activity: This item shows how users search for content on your site, such as the number of searches, the search terms used, the number of results returned, and the click-through rate.
User Login History Option: This item shows how users log in to your site, such as the number of logins, the login methods used, the login duration, and the login frequency.
Contact Support page Activity: This item shows how users interact with your contact support page, such as the number of visits, the bounce rate, the average time on page, and the conversion rate.