Which one of the following artificial sweeteners is modified sugar ?

Which one of the following artificial sweeteners is modified sugar ?

Aspartame
Saccharin
Sucralose
Alitame
This question was previously asked in
UPSC CAPF – 2017
Sucralose is an artificial sweetener that is a modified sugar.
Sucralose is derived from sucrose (table sugar) by replacing three hydrogen-oxygen groups on the sucrose molecule with chlorine atoms. This chemical modification makes it about 320 to 1,000 times sweeter than sugar but indigestible by the body, hence providing virtually no calories.
Aspartame is a methyl ester of a dipeptide of the amino acids aspartic acid and phenylalanine. Saccharin is a synthetic sweetener with a bitter aftertaste, discovered in 1879. Alitame is a high-potency dipeptide-based artificial sweetener. Unlike sucralose, these are not chemically modified forms of sucrose.