Which of the following is not true regarding the contracts of intoxicated persons?

a$.$

If an intoxicated person is unable to understand the nature and consequences of his act, then the contract is voidable.

b$.$

Slight intoxication will destroy one's contractual capacity.

c$.$

Contracts made while a person is too intoxicated to act in a reasonable manner may be ratified when the intoxicated person regains his capacity.

d$.$

The effect of intoxication is generally the same as that given to contracts that are voidable because of incompetency.