I think it will be only Chrome: See Prerequisites https://docs.cyberark.com/pam-self-hosted/Latest/en/Content/PCP/PCP-installation.htm?tocpath=Developer%7CCreate%20extensions%7CPlugin%20Generator%20Utility%7C_____1 In the downloaded PGU package from the marketplace there is only chromedriver.exe with SeleniumIDE (for Chrome,FireFox and Edge) ChromeDriver is a crucial component when automating Chrome browser tasks using Selenium WebDriver. Without it, Selenium WebDriver wouldn't be able to interact with the Chrome browser.

Of the browsers listed Chrom is actually a prerequisite for the PGU install therefore the answer is B. however it may be worth noting that Microsoft Edge is also a supported browser. https://docs.cyberark.com/PAS/Latest/en/Content/PCP/PCP-installation.htm?tocpath=Developer%7CCreate%20extensions%7CPlugin%20Generator%20Utility%7C_____1#:~:text=Install%20Google%20Chrome https://docs.cyberark.com/PAS/Latest/en/Content/PASIMP/psm_WebApplication.htm?tocpath=Developer%7CCreate%20extensions%7CPSM%20Connectors%7C_____2#:~:text=Connectors%20Framework.-,Supported%20browsers,-CyberArk%20may%20choose

The following browsers are supported: Google Chrome (32-bit), version 100 or later Microsoft Edge (32-bit), version 103 or later https://docs.cyberark.com/Product-Doc/OnlineHelp/PAS/Latest/en/Content/PASIMP/psm_WebApplication.htm?Highlight=google%20chrome%20through%20PSM