A Nurse Researching Physical Therapy Enters the Words "Physical" and "Therapy

A nurse researching physical therapy enters the words "physical" and "therapy" into the keyword search bar of a database. What should the nurse do to the two keywords to obtain the most relevant results?

A) Remove the space between the words.
B) Add parentheses around the words.
C) Add the word "AND" between the words.
D) Truncate the words.