Which of the following statements accurately describes the structure of sphingosine?

Sphingosine is a 20 carbon amino alcohol with a trans double bond derived from palmitate and glycerol.

Sphingosine is an 18 carbon amino alcohol with a cis double bond derived from glycerol and serine.

Sphingosine is an 18 carbon amino alcohol with a trans double bond derived from palmitate and serine.

Sphingosine is a 16 carbon amino alcohol with a cis double bond derived from palmitate and serine.