Which of the following best describes the metaphor in this poem?

The sand bar symbolizes a barrier between good and evil.

The sand bar symbolizes an obstacle to finding one's true love.

The sand bar symbolizes a barrier between life and death.

none of these

Crossing the Bar

Sunset and evening star,

And one clear call for me!

And may there be no moaning of the bar,

When I put out to sea,

But such a tide as moving seems asleep,

Too full for sound and foam, When that which drew from out the boundless deep

Turns again home.

Twilight and evening bell,

And after that the dark!

And may there be no sadness of farewell,

When I embark:

For though from out our bourn' of Time and Place

The flood may bear me far,

I hope to see my Pilot face to face

When I have crossed the bar.