Export network from DN designer!

When exporting a network from the Deep Learning designer App to the workspace, there are three choises: 1- Export, 2- Generate code, 3- Generate code with pretrained parameters. I would like to know :

• Does (1- Export) generate a layergraph in the workspace with a pretrained parameters? or without?

Becaues I have tryed the three choises and find out that each one yields different results in terms of the accuracy and time required for each epoch? I understand the difference between the second and thired one but the generated graph of the first chose should be similar to one of them? In my case I would like to ensure training the network only by my data without any previous pretrained parameters!

thanks.