=+2. With reference to Figure 6.12, which of the following statements are true? Choose all options that

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=+2. With reference to Figure 6.12, which of the following statements are true? Choose all options that apply.

(a) X3 can interact with the system using UC4.

(b) X1 can interact with the system using UC1 and UC4.

(c) X3 and X1 are different kinds of X2.

(d) UC3 is an abstract use case with no steps of its own.

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