Certification Information for PD


I wanted to know more information about PD certifications. I have gone through https://university.pagerduty.com/page/certification but it does not list below information:

a) How to register for certification. Is it only available at Summit? Can a person take it at any time?
b) For one such as PagerDuty Foundational Practitioner Certification - Core Competencies - what are the specific areas that are tested?
c) Is there a sample Q&A available?