Which of the following is not true about regular verb

No choices are given so I'll just list down the reasons why a regular verb is called a regular verb.

1) Its past and participle are the same.
2) Regular verb is a verb whose past tense and past participles are formed by adding -ed or d to the end of the verb.

For example:
Present tense:   plan             roll         dry
Past tense :       planned       rolled     dried
Past Participle : planned       rolled     dried
*see the past tense and past participle are the same.

Examples of irregular verbs.
Present tense:  write        break     meet
Past tense     :  wrote       broke     met
Past Participle: written     broken   met
*notice that the past and past participle are different. No -ed or d is added to the end of the verb.