$5$

$($a$)V_{Th}=8V$

b$)V_{Th}=68V$

c$)V_{Th}=42V$

d$)V_{Th}=18V$

e$)$ None of the above

For the circuit in Figure $5,$ determine the Thevenin Resistance with respect to the terminals a and $b.$

a$)R_m=4$

b$)R_{Th}=22\mathrm{.}77$

c$)R_h=7\mathrm{.}64$

$($d$)R_{Th}=2\mathrm{.}12$

e$)$ None of the above

I just Need help finding the thevenin resistance! Thank you