Relative sweetness (compared with sucrose = 1, mass for mass) is taken as: aspartame 100, saccharin 550, sucralose 600, alitame 2000. The correct increasing order of sweetness is

1. Aaspartame $<$ saccharin $<$ sucralose $<$ alitame
2. Bsaccharin $<$ aspartame $<$ sucralose $<$ alitame
3. Caspartame $<$ sucralose $<$ saccharin $<$ alitame
4. Daspartame $<$ saccharin $<$ alitame $<$ sucralose