Which letter-cluster will replace the question mark (?) to complete the given series?

ZLPT, LABI, XPNX, ?, VTLB​​

ZLPT, LABI, XPNX, ?, VTLB

Z − 14 → L

L − 14 → X

X − 14 → J

J − 14 → V

L − 11 → A

A − 11 → P

P − 11→ E

E − 11 → T

P − 14 → B

B − 14→ N

N − 14 → Z

Z − 14 → L

T − 11 → I

I − 11 → X

X − 11→ M

M − 11 → B

So, the missing term is: JEZM 

Thus, correct option is (b).