Consider the following pieces of identification a person might have in order to apply for a credit card: B: Applicant presents a birth certificate.
D: Applicant presents a driver's license.
M: Applicant presents a marriage license.

Write a logical expression for the requirements under the following conditions:

a. The applicant must present either a birth certificate, a driver's license or a marriage license.
b. The applicant must present at least two of the following forms of identification: birth certificate, driver's license, marriage license
c. Applicant must present either a birth certificate or both a driver's license and a marriage license.