[Grammar] What is correct?

[rupeshjain_xie]

what is corect
1.The productivity of an employee hits the bottom, when he/she is made to work not only on Saturdays but also on Good Friday
2.The productivity of an employee hits the bottom, when they are made to work not only on Saturdays but also on Good Friday

 

[hope2010]

what is corect
1.The productivity of an employee hits the bottom, when he/she is made to work not only on Saturdays but also on Good Friday
2.The productivity of an employee hits the bottom, when they are made to work not only on Saturdays but also on Good Friday

To me both fine. You ar asking here about the use of the pronoun 'they' as a way to solve the problem of repeating the gender ones (he/she).

To me I find it ok. I notice that many English speakers use 'they' in place of 's/he'. Of course grammar books would go for 'he/she' but things change!

Hope a native speaker ellaborates on this.