Maribel is 72 years old at the end of the taxable year (20X1) and is a pensioner after working for 35 years. For 20X1, Maribel received an Informative Return indicating that she received a pension of $12,000 from the retirement fund and no income tax was withheld. Assume that Maribel did not generate any other type of income during 20X1. Does Maribel have the obligation to file an income tax return for 20X1?