What Is the Mechanism of Action of Imatinib Mesylate (Gleevec)

What is the mechanism of action of Imatinib mesylate (Gleevec) ?

A) Inhibits the activity of the BCR/ABL oncogene to keep the number of blasts low
B) Recognizes the mutated cells, attaches to them, and induces apoptosis
C) Upregulating the activity of interferons to increase host defense mechanisms and protect healthy cells from invasion
D) A ribonucleotide reductase inhibitor which damages the DNA/RNA, preventing the cell to duplicate