For your first 100 B2B customers, what actually worked? Real answers please

Trying to settle this with data instead of LinkedIn-guru lore. If you took a B2B product from 0 to ~100 customers, what channel did the work?

A) Cold email
B) Warm intros / network
C) Content / audience
D) Social outreach from your own profile
E) Paid
F) Something else

Drop a letter, plus a line on why if you've got it. My bias: B and D are underrated, A is oversubscribed in 2026. Tell me I'm wrong.