true or false. any help is appreciated thank you

Evaluate below each statement about the method of matching in observational studies and indicate whether the statement is True or Matching involves discarding cases in the original data set for [ Choose ] which no close match is identified. Matching is used to construct a data set that is balanced with [ Choose ] respect to one or more known variables from an initially unbalanced data set. Matching happens before the [ Choose ] experimenter randomizes units to treatment and control groups. Matching happens after the [ Choose ] experimenter randomizes units to treatment or control groups. Matching ensures a balanced data [ Choose ] set for unmeasured confounders as well as known/measured confounders