What is the theme of William Shakespeare’s Sonnet 116?
" Let me not to the marriage of true minds Admit impediments. Love is not love Which alters when it alteration finds, Or bends with the remover to remove: O, no! it is an ever-fixed mark, That looks on tempests and is never shaken; It is the star to every wandering bark, Whose worth's unknown, although his height be taken. Love's not Time's fool, though rosy lips and cheeks Within his bending sickle's compass come; Love alters not with his brief hours and weeks, But bears it out even to the edge of doom. If this be error and upon me proved, I never writ, nor no man ever loved."

1) steadfastness of love
2) immortality of art
3)power of time and nature
4) uncertainty of life