What is the composition of the alloy that exhibits the property of shape memory?
- A$45\% \, Ti$ and $55\% \, Ni$
- B$8\% \, Ni, 18\% \, Cr$ and remaining $Fe$
- C$67\% \, \text{to} \, 70\% \, Ni$ and remaining $Cu$
- D$60\% \, Ni$ and $40\% \, Cr$
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