Draw compounds that fit the following descriptions:
(a) A chiral alcohol with four carbons
(b) A chiral carboxylic acid with the formula $\mathrm{C}_{5} \mathrm{H}_{10} \mathrm{O}_{2}$
(c) A compound with two chirality centers
(d) A chiral aldehyde with the formula $\mathrm{C}_{3} \mathrm{H}_{5} \mathrm{BrO}$