The IUPAC name of the compound \(CH_3-\overset {O\\||}C-CH_2-\overset{CN\\\,|}{\underset {\,\,\,|\\\,\,CH_3}C}-CH_3\)
a. 2–cyano–2–methyl–4–oxopentane
b. 4–cyano–4–methyl–2–pentanone
c. 4–cyano–4–methyl–2–oxopentane
d. 2,2 dimethyl–4–oxo–pentanenitrile