Consider the following statements concerning Chester Barnard's theories on organizational structures:

1. Chester Barnard emphasized that the effectiveness of formal organizations is significantly influenced by how well they integrate and harmonize with their inherent informal structures.
2. Barnard asserted that the predominant responsibility of executives within organizations is to strictly enforce bureaucratic rules, sidelining the dynamics of informal organization.

Which of the above statements is/are accurate based on Barnard's perspectives?