Should be basic only as allowances are not given or considered for the said period. If you provide DA, then it should also be considered. However, many companies request for the Net salary (after deduction of taxes, as tax is not applicable on the income not made). Additionally, any other subsidies or deductions should not be considered in the amount.
What is the 'exact' wording written in the employment agreement (Appointment letter)?
Best Regards, Amod.