Which of the following statements is true regarding chronic myeloid leukemia (CML)?

a) Proliferation of mature myeloid cells occurs.
b) Constitutional symptoms such as fatigue, weight loss, and night sweats are not commonly seen.
c) The first-line treatment for CML blast crisis is imatinib.
d) The Philadelphia chromosome is formed due to the bcr-abl t(9;22) translocation.