4. A particle encounters a position-dependent potential energy as shown in the figure to the right. Choose the CORRECT statement(s):

(A) The maximum kinetic energy of the particle is 4×10⁻²⁰ J when its total energy is E₁.
(B) The maximum kinetic energy of the particle is 4×10⁻²⁰ J when its total energy is E₂.
(C) The particle experiences no force at r = 2×10⁻¹⁰ m when its total energy is E₁.
(D) The particle experiences no force at r = 2×10⁻¹⁰ m when its total energy is E₂.
(E) The particle experiences a maximum attractive force at r = 4×10⁻¹⁰ m when its total energy is E₂.