The conditional preprocessor directive ____ means "if defined".

A) #ifdef
B) #ifndef
C) #ifdefined
D) #if_def

A table formula can use a table reference to refer to column names instead of cell addresses.

Which Linux command is used to search text or a specific file for lines that match a specific text string?

A) search
B) ls
C) apt-get
D) grep

RAM memory is nonvolatile.