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New Device tells smiles from frowns...even through a mask

What does the word "unveiled" suggest as it is used in this selection?

Zhang's group unveiled its new system in October 2020. The researchers shared details about it at a virtual conference of the Association for Computing Machinery Symposium on User Interface Software and Technology.

Researchers at the virtual conference had already seen the C-Face system many times.
Researchers at the virtual conference were disappointed with the last version of the C-Face.
Zhang's group felt hesitant about sharing their findings and work on the C-Face.
Zhang's group was introducing the C-Face for the first time at the virtual conference.

What is the definition of "corresponded" as used in this sentence?

Once training was complete, the device could look at cheek contours and predict the position of landmarks around the eyes and mouth that corresponded to particular facial expressions.

kept in contact with
attached to an object
had a close similarity to
communicated back and forth

Right now, when he's cooking and talking to family at the same time, he puts the phone down on a table. "All they see is my ceiling," he says. If he were wearing C-Face, his family could see an engaging virtual avatar, or digital version, instead. If only they could smell the food virtually, too.

Why did the author include this information?

to highlight the way C-Face researchers have been using the device in their labs
to highlight one possible and practical use people might have for C-Face in the future
to explain how the pandemic changed the way researchers designed the C-Face
to explain a potential problem people might experience when using the C-Face for long periods
Which sentence from the introduction [paragraphs 1-9] BEST introduces the C-Face to the reader?
But instead of playing sound, it points cameras toward his cheeks.
A computer system connected to the headphones can figure out what Chen's eyes and mouth look like without seeing them directly.
Chen, who studies computer science in the lab of Cheng Zhang at Cornell University in Ithaca, N.Y., came up with the idea for this system.
For example, your phone might recognize when your face looks upset and suggest calming music.
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