Answer: The bullet points identifying the two main messages of the text best indicate the purpose of this text.
Explanation: They highlight the key policies and guidelines regarding electronic communications for Infinity Investments employees.
A is wrong because it is too vague and excludes the last half of the heading.
B is most likely wrong (as I cannot see if anything is italicized)
C is wrong as the heading states specifically for infinity investments employees, not all employees.
D is right.