From which embryonic germ layer is skeletal muscle derived?

Smooth muscle fibres differ from striated muscle fibres in their external covering by:

The given characteristics are observed in .......
$-$ They are located in the inner wall of the alimentary canal.
$-$ They do not show any striations.
$-$ They are non-striated and spindle-shaped.
$-$ They are involuntary and innervated by the autonomic nervous system.

Select the correct option from the following.

An example of unstriated (smooth) muscles,which are entirely involuntary,is located in:

Smooth muscles are_