Answer : 2. "2"
Explanation :

had I will replace I had because – When a negative Adverb/Adverbial Expression (no sooner, hardly/barely/scarcely), is used at the beginning of a clause; it is followed by Aux. Verb + Subject.

Look at the examples given below :

No sooner had he finished dinner

                   ↓    ↓

            Aux.V. Subject

than he started feeling sick.

Hardly had she arrived, when problems started.

              ↓    ↓

        Aux. V. Subject

Hence, had I spoken is the right usage