If the user must not select multiple values I recommend to use radio buttons. The formula in the "Text"-Property of the label would be:
Radio1.Selected.Value
If the user should be able to use multiple values and you want to show all of them in the label the formula for the "Text"-Property of the label could be something like this:
Left(
If(
Checkbox1.Value;
Checkbox1.Text & ", ";
""
) & If(
Checkbox1_1.Value;
Checkbox1_1.Text & ", ";
""
) & If(
Checkbox1_2.Value;
Checkbox1_2.Text & ", ";
""
);
Len(
If(
Checkbox1.Value;
Checkbox1.Text & ", ";
""
) & If(
Checkbox1_1.Value;
Checkbox1_1.Text & ", ";
""
) & If(
Checkbox1_2.Value;
Checkbox1_2.Text & ", ";
""
)
) - 2
)
Don't forget to rename the radio buttons/ checkboxes.