In this task, you're given a question, a context passage, and four options which are terms from the passage. After reading a passage, you will get a brief understanding of the terms. Your job is to determine by searching and reading further information of which term you can answer the question. Indicate your choice as 'a', 'b', 'c', or 'd'. If you think more than one option is plausible, choose the more probable option to help you answer the question.

Question: Which of the clubs that Pietro De Giorgio played for has existed the longest? Passage:Born in Praia a Mare, Calabria region, De Giorgio spent a season with Serie D club Battipagliese before he was signed by a professional club San Marino in 2001 in temporary deal from Napoli. In January 2002 he left the Serie C2 club for Serie B club Napoli, the parent company of San Marino Calcio at that time. In 200203 season he was signed by Serie C1 club Cittadella in temporary deal. In January 2003 he was signed by Serie B club Messina along with Andrea Gaveglia in co-ownership deals, for a total fee of 26,000. In June 2003 the deals were renewed. De Giorgio also returned to Serie C2 for Melfi after only 1 appearances in the whole 200203 Serie C1. In June 2004 the co-ownership deals were extended again. However Napoli bankrupted at the start of season. Thus, De Giorgio who initially joined Serie C1 club Frosinone in temporary deal, was converted into new co-ownership deal.
Links: a. A.S. Cittadella b. S.S.C. Napoli c. A.S.D. Battipagliese d. 200203 Serie C1
c