Utilize the input text as a context reference, choose the right relationship between 'United Internet' and 'Internet service provider' from the options.
Options: brand, director/manager, product/material produced, industry

The top riser on the FTSEurofirst 300 was United Internet AG , which climbed 7.2 percent after the German Internet service provider said it may float its business offering web-hosting and other online services to corporate customers.
industry