Which RNA type I should considered as long non-coding RNAs

Hello

We have exosome-sequensing (from plasma). In raw read counts file, I see 72650 gene names.

This is how my read count file looks like

I have created a percentage bar chart for categories of RNAs annotated in this exosome-seq like

Which category (RNA type) I should consider as long non-coding RNA (lncRNA) ?

Can I consider this observed24% Long intergenic non-coding RNA (lincRNA) (sense+antisense) as long non-coding RNA (lncRNA) ?

But as I read Generally speaking we don’t expect much lncRNA/mRNA in plasma and much of that will be heavily fragmented which makes it very difficult to sequence. So how I see 24% of lincRNAs ?

If this was your data, which type of RNAs here you would considered as long non-coding RNA (lncRNA) ?

Thanks for any intuition