In Mammalian Fatty Acid Synthase, Malonyl CoA Provides a Malonyl

In mammalian fatty acid synthase, malonyl CoA provides a malonyl group which:

A) Covalently attaches to a serine hydroxyl group at a site on one subunit of the enzyme and is then transferred to the -SH of a phosphopantetheinyl group of the acyl carrier protein on the second subunit of the enzyme.
B) Covalently attaches to a serine hydroxyl group at a site on one subunit of the enzyme and is then transferred to the -SH of a cysteine group of the condensing enzyme domain on the same subunit of the enzyme.
C) Both
D) Neither