Which of these objects have NOT been found in the Galactic Halo?

Name: Which of these objects have NOT been found in the Galactic Halo?
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Question

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Emission nebulae are typically found in regions of active star formation, which is not characteristic of the Galactic Halo. The other objects listed (RR Lyrae variables, Population II stars, globular clusters) are commonly found in the Galactic Halo. Planetary nebulae, while not specific to the Galactic Halo, can also be found there.

Which of These Objects Have NOT Been Found in the Galactic