Consider the following language families:

L₁ ≡ The context – free languages

L₂ ≡ The context – sensitive languages

L₃ ≡ The recursively enumerable languages

L₄ ≡ The recursive languages

Which one of the following options is correct?

L₁ ⊆ L₂ ⊆ L₃ ⊆ L₄

L₂ ⊆ L₁ ⊆ L₃ ⊆ L₄

L₁ ⊆ L₂ ⊆ L₄ ⊆ L₃

L₂ ⊆ L₁ ⊆ L₄ ⊆ L₃

Consider the following language families: L1 ≡ The context – free languages L2 ≡ The context – sensitive languages L3 ≡ The recursively enumerable languages L4 ≡ The recursive languages Which one of the following options is correct?