Lawyer Lenny listed the following entry for March 7. 2023 in a bill sent to his client on a particular case: "March 7, 2023: reviewed medical records; met with client to prepare for deposition; participate in client's deposition; draft lett to opposing counsel re. identification of additional expert witness. 7.2 hours" This is an example of: a. preliminary billing b. banded billing c. block billing d. cumulative billing