In the living room, Qin noticed that an heirloom vase was missing from the mantelpiece. At that moment, Nkiruka and Aarav came in from the garden. Qin asked them if they had seen the vase. Nkiruka said she saw Jia-Li rearranging the room earlier. Aarav added that Jia-Li mentioned the vase would be safer in the study since they were expecting a lot of guests for the evening. Earlier that day, before Jia-Li could move the vase, Terrell had entered the study to retrieve a book but had not seen the vase. Who knows where the vase is currently, and how is Terrell involved?

Provide a brief response.
Jia-Li knows where the vase is because she intended to move it to the study for safekeeping. However, this does not necessarily mean that she has already moved it; she might be planning to do so. Nkiruka is only aware that Jia-Li has been rearranging the room but not of the whereabouts of the vase after the rearrangement. Aarav knows Jia-Li's intention to move the vase to the study because Jia-Li has expressed this intention to him, but Aarav has not confirmed if the vase was actually moved. This suggests that Aarav believes the vase might be in the study, though he may not know for certain. Terrell, who went into the study before Jia-Li moved the vase, did not see the vase there, but this does not mean he knows where it currently is; it only informs us that the vase was not in the study at the time of his visit. Therefore, based on the information provided, Jia-Li is the only person who definitely knows the current location of the vase, and Terrell is indirectly involved as his observation confirms that the vase had not been moved to the study at the time he retrieved his book.