Which one has an optical isomer?

Question

butryic acid
t-butanol
2-bromo-2-methylbutane
2-amino-2-methyl-butal-1-ol

I know it's not t-butanol or 2-bromo-2-methylbutane.
Is it 2-amino-2-methyl-butal-1-ol?

Correction to above:

2-amino-2-methyl-butan-1-ol (Butan is with an "n" not "l"

IF this is the same as 2-amino-2-methyl-1-butanol, yes that would be optically active.