When configuring an Avamar node using the text-based YaST utility, particularly over a serial console or certain remote management tools, the Backspace key may not function as expected due to terminal emulation differences. In these standard Linux/Unix environments, the Ctrl-h key combination sends the ASCII backspace control character (^H), which correctly performs the backspace action within the YaST interface. This is a common and documented workaround for this specific setup scenario.

B. Ctrl-b is a standard shortcut for moving the cursor back one character without deleting, not for backspacing.

C. The Backspace key is the intended key, but the premise of the question implies a common scenario where it does not work correctly.

D. Ctrl-c is the standard command to send an interrupt signal, which typically terminates the current process, rather than performing a backspace.

1. Avamar Post-Installation and Upgrade Tasks Technical Note (P/N 302-002-276), Page 11, "Configuring network settings with yast". The document explicitly states, "If the Backspace key does not work, use Ctrl+h."

2. SUSE Linux Enterprise Server 11 Administration Guide, Section 3.1.1, "Navigation in Modules". Mentions keyboard navigation for ncurses-based YaST interfaces, where control characters like Ctrl-h have defined functions.