Order of Riemann tensor indexes and the Ricci Identity

Question

I have seen the Ricci identity written variously as

1. $R_{ijk}{}^l x^k = (\nabla_i\nabla_j- \nabla_j\nabla_i) x^l$
2. $R_{ij}{}^l{}_k x^k = (\nabla_i\nabla_j- \nabla_j\nabla_i) x^l$
3. $R^l{}_{kij} x^k = (\nabla_i\nabla_j- \nabla_j\nabla_i) x^l$

To my understanding 2. and 3. are equivalent but 1. has the opposite sign due to the symmetries of the Riemann tensor. Oddly I do not recall ever seeing the 4 possible variant.

Which is the correct form?