Which of the Following Rules Is at the Heart of Google's

Which of the following rules is at the heart of Google's culture?

A) Stay technologically intelligent and hold people accountable for results.
B) Be flexible in different situations and show respect for others.
C) Put customers first and give low priority to competition.
D) Think of your work as a calling with a mission that matters and give people more trust, freedom, and authority than you are comfortable giving.