Which of the following gastric cells indirectly help in erythropoiesis?

Parietal cells (or oxyntic cells) in the stomach secrete $\text{HCl}$ and Intrinsic Factor. Intrinsic factor is essential for the absorption of Vitamin ${\text{B}}_{12}$ in the ileum. Vitamin ${\text{B}}_{12}$ is required for the maturation of $\text{RBCs}$ (erythropoiesis). Therefore, parietal cells indirectly assist in blood cell production.