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Which of the following is true regarding the term "capacity to contract"?

Select one:

a$.$ It refers to the fact that all parties must sign a contract for it to be valid

b$.$ It refers to the fact that contracts must respect certain standards of public order and laws of general protection

c$.$ It refers to the fact that persons who enter contracts must do so freely and without constraint

d$.$ It refers to the fact that contracts must be in writing to be valid

e$.$ It refers to the fact that minors may not, as a rule, enter into contracts unassisted

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