Final answer:
The two valid methods for calculating the values of a field using a calculation expression are applying the calculation to each selected field and calculating only the selected records.
Step-by-step explanation:
The two valid methods for calculating the values of a field using a calculation expression are:
- If more than one field is selected, the calculation can be applied to each field.
- If any records are currently selected in the table, only the selected records will be calculated.
Field names in VB calculations must be enclosed in square brackets [ ], while in Python calculations, field names must be enclosed in double quotes " ".