You have created a new block and will be adding this block on every page. The block contains user-specific information and cannot be cached. The block is added to the default.xml with: 
A. The block will be loaded on the store front using AJAX
B. FPC will cache the block content for all cacheable pages
C. FPC will be bypassed for this block and all other page content will be cached
D. All store front pages are no longer cacheable
