Etymology

Step 1: Understand etymology.
Etymology is the study of the origin of words and the way in which their meanings have changed throughout history.

Step 2: Trace the origin of the word "liberty".
The English word "liberty" comes from the Old French "liberte," which in turn comes from the Latin word "libertas.
" "Libertas" means freedom, condition of a freeman, or independence.
The Latin word "libertas" itself is derived from "liber," which means "free.
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Step 3: Evaluate the options.
Option (1) Latin word 'Liber': This is correct.
"Liber" (meaning free) is the root of "libertas," from which "liberty" is derived.
Option (2) Greek word 'Liber': "Liber" is a Latin word.
The Greek equivalent for "free" is "eleutheros" (ἐλεύθερος), from which "eleutheria" (freedom) is derived.
Option (3) French word 'Liber': While "liberté" is French for liberty, and "libre" is French for free, the ultimate root is Latin.
"Liber" itself is not typically cited as a direct French root in this context.
Option (4) English word 'Liber': "Liber" is not an English word in this context; it is the Latin root.

Step 4: Confirm the origin.
The term "liberty" is derived from the Latin word "liber" (meaning free), via "libertas.
" This matches option (1).