Refer to the input text as context and select the correct relationship between 'MIUI' and 'Xiaomi' from the available options.
Options: owned by, developer, location of formation, operator

Xiaomi has refined MIUI over the past year to create MIUI 7, which has a colourful interface with better performance, battery-saving optimisations and an even wider variety of personalisation options,” Xiaomi said in a statement.
developer