Which of the following is true about the relationship between diversity in managers and innovation

According to research, which of the following is true about the relationship between diversity in managers and innovation?

At companies with diverse management teams, openness to contributions from lower-level workers and an environment in which employees feel free to speak their minds are crucial for fostering innovation.

the innovation boost is limited to a single type of diversity, gender based.

The positive relationship between management diversity and innovation is statistically not significant.
To reach its potential, gender diversity needs to stay as tokenism.

Management diversity seems to have a particularly negative effect on innovation at complex companies.