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What is the best way to combine the following sentences?
1)"The first stop for these items is probably an MRF, where the real recycling takes place."
2) "An MRF is a materials recovery facility."
a. The first stop for these items is probably a materials recovery facility, or MRF, where the real recycling takes place.
b. the first stop for these items is probably a materials recovery facility, an MRF, this is where the real recycling takes place.
c. The first stop for these items is probably a material recovery facility, where the real recycling takes place, an MRF.
d. The first stop for these items is probably a materials recovery facility and an MRF, where the real recycling takes place.
a. The first stop for these items is probably a materials recovery facility, or MRF, where the real recycling takes place.