Take context from the input text and decide on the accurate relationship between 'Syriza' and 'Athens' from the options provided.
Options: brand, chairperson, platform, headquarters location

Even Germany's Wolfgang Schaeuble, who last month floated a Greek exit from the euro as Tsipras hesitated to agree terms with fellow leaders, sounded upbeat, if still wary of a new tone in Athens that caused an angry split in Tsipras' leftist party, with nearly a third of Syriza lawmakers rebelling in parliament.
headquarters location