What action did Facebook's COO,Sheryl Sandburg,take in response to the complaint?

Question

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A) Sheryl Sandburg issued a half-hearted apology on behalf of Facebook, stating the
study was part of ongoing research companies do to test products and apologized for the lack of communication and stated it was unclear whether Facebook and other major websites would continue the practice.
Y) Sheryl Sandburg issued a half-hearted apology on behalf of Facebook, stating the study was part of ongoing research companies do to test products and apologized for the lack of communication and stated it was unclear whether Facebook and other major websites would continue the practice.
Z) Sheryl Sandburg issued a half-hearted apology on behalf of Facebook, stating the study was part of ongoing research companies do to test products and apologized for the lack of communication and stated it was unclear whether Facebook and other major websites would continue the practice.
[) Sheryl Sandburg issued a half-hearted apology on behalf of Facebook, stating the study was part of ongoing research companies do to test products and apologized for the lack of communication and stated it was unclear whether Facebook and other major websites would continue the practice.

What Action Did Facebook's COO,Sheryl Sandburg,take in Response to the Complaint