Consider the following sets:
L1 = {apbq | p+q $\geqslant$ 106}
L2 = {ambn | m-n $\geqslant$ 106}
p,q,m,n $\in \mathbb{N}$
A. Both L1 and L2 are regular
B. L1 is regular and L2 is not
C. Neither L1 nor L2 is regular
D. L2 is regular and L1 is not
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