Thank youR3 (and R4) are doing about the same thing. With R4 especially, it is giving a path for C to B leakage currents to go besides going back into B and again to E. these leakage currents increase with temperature, so that resistor helps keep the device off when it should be off.
R3 has an additional task of letting the Zener currents have a path around the transistor when the Zener is "off," remembering that off is only relative and currents do flow.
If you leave them both out the circuit may work just fine. Or not. Or if you build 100 units only 80 seem to work. Or you find none work unless you buy your parts from certain manufacturers.
Thus it is good practice to have a resistor there to catch small currents and insure the transistor stays off.
I don't see how you can get an answer much more specific than Ernie gave you.Thank you
I did not understand much
I wish more specific answer
Well perhaps someone else could explain it another way our friend may comprehend it better.I don't see how you can get an answer much more specific than Ernie gave you.