Information about the speakers is presented in the text. Which of the following statements is TRUE?

There is a speaker who has a degree in Biology and Mathematics.
One of the speakers has a PhD from the University of Berkeley.
All speakers have worked in the public sector.
One of the speakers is the Director General of the National Council of Science and Technology of Mexico.
a) Only statements 1 and 2 are true.
b) Only statements 2 and 3 are true.
c) Only statements 3 and 4 are true.
d) Only statements 2 and 4 are true.
e) All statements are true.