Final answer:
To calculate the unpaid balance on Velida's mortgage, specific loan details are required which are not provided in the question. Normally, an amortization formula would be used considering the original loan amount, interest rate, and payment history.
Step-by-step explanation:
To determine the unpaid balance on Velida's mortgage after her initial mortgage period expires, more information is needed such as the original loan amount, interest rate, and the duration of the initial period. Without these details, it is impossible to accurately calculate the remaining balance or choose the correct option (a $126,805.34, b $122,773.09, c $138,224.23, or d $123,740.97). It is also evident that the information provided is a mix of unrelated examples that do not pertain directly to Velida's mortgage scenario.
To solve a problem like this one generally, one would use an amortization formula or schedule which calculates the payment amount at various intervals and keeps track of the interest and principal portions of each payment. It is important to apply the terms of the loan properly to arrive at the correct remaining balance.