\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
Consider the following calculation program:
  1. Choose a number.
  2. Multiply the chosen number by \(3\).
Let \(x\) be the number chosen initially. Determine the function \(f\) that corresponds to the result obtained with this program.
Choose one answer: