Select R1 such that the collector current of Q1 becomes 0. 25 mA, assuming Vbe = 0. 7V and the base current has an insignificant effect in this problem.
a) 2. 8 kΩ
b) 3. 2 kΩ
c) 3. 6 kΩ
d) 4. 0 kΩ