In high-speed rail, HSR sector, major contracts signed in the past quarter, including train control center, TCC, solution for sections of the Taiyuan to Jiaozuo line, Zhengzhou to Wangzhou line and the inter-city line of Southern Sichuan.
Analyze the relationship between 'Zhengzhou' and 'line' within the context of the input sentence.
Options: parent organization, owner of, distributed by, owned by