F-string, NS5-brane & D-string

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The discussion explores the relationship between fundamental strings (F-strings), NS5-branes, and extremal p-brane solutions in supergravity and Yang-Mills theories. It questions whether F-strings and NS5-branes are equivalent to extremal p-branes and how these constructs relate to D-branes. F-strings are identified as solitonic solutions of the SUGRA-YM equations coupled to the NS-NS 2-form, while D-strings correspond to solutions involving R-R 2-form couplings. The conversation also addresses the implications of these distinctions for heterotic supergravity, particularly in the context of closed string theories. Overall, the relationship between these string and brane solutions is crucial for understanding their roles in string theory.
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Is the fundamental string (F-string) same as an extremal 1-brane solution of su-gra-YM?
Can the same be said for the fundamental fivebrane (NS5-brane) and 5-brane?
Also, what kind of solution is a D-string?
 
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As a follow-up:

If F-strings & NS5-brane are different from extremal p-branes, then when p-branes are identified with as fundamental a construct as D-branes, how are F-strings & NS5-branes elevated?

If F-strings & NS5-brane are not different from extremal p-branes, what can we make out of these brane solutions in heterotic sugra when heterotic string theories are closed string theories (no open strings -> no branes to end on).
 
I asked around and got the following answer:

F-string is the solitonic solution of SUGRA-YM equations coupled to the NS-NS 2-form (B-field), whereas D-string are solutions of equations with R-R 2-form couplings.
F-strings are elevated to the normal strings of string theory, whereas D-strings are the D1-branes.
 

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