How many subnets should I reference in severless.yaml for Lambda deploying

Hi, new here!

My lambda functions lives outside VPC, but now we have a requirements of accessing restricted services so now we need to add VPC configurations to serverless.yaml

when I do it with console, after selecting my VPC it show me 3 different VPC, my question is which one should I select and can I select all?

looking forward for response!

You get what you settle for