Write the Word or Phrase That Best Completes Each Statement $$\text { Let } A \text { be a } 5 \times 1 \text { matrix. Write a matrix } B \text { such that } A B \text { can be found. }$$

Write the word or phrase that best completes each statement or answers the question.
- $$\text { Let } A \text { be a } 5 \times 1 \text { matrix. Write a matrix } B \text { such that } A B \text { can be found. }$$