The BHP Billiton Mozal smelter, for example, consumes two-thirds of the electricity generated in Mozambique but employs only 1,070 people at its plant in Maputo and 3,500 downstream, with jobs ranging from catering to sewing uniforms, according to its own figures.
In the context of the input sentence, determine the relationship between 'Mozal' and 'Maputo'.
Options: distribution format, platform, chief executive officer, headquarters location