Which file determines the location of the installation script during a scripted upgrade?

The boot.cfg file is parsed by the ESXi bootloader and contains the kernelopt line, which includes the ks= parameter specifying the URL or path to the kickstart script. This file controls how the boot modules are loaded and where the installer finds its scripted configuration, making it the authoritative pointer to the installation script.

ks.cfg is the kickstart script itself that contains upgrade instructions; it is the file being pointed to, not the file that specifies its own location.

script.cfg is not a recognized or standard configuration file in the ESXi installation or upgrade boot process.

upgrade.cfg is not a standard ESXi file used during the scripted upgrade boot sequence.