Utilize the input text as a context reference, choose the right relationship between 'Zhengzhou' and 'line' from the options.
Options: owned by, owner of, distributed by, parent organization

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.
owner of