For how long can a probationary employee's period be extended if it exceeds the usual limit?

The correct choice indicates that a probationary employee's period can be extended by a length that is agreed upon in writing. This approach emphasizes the importance of mutual consent between the employer and employee regarding any extension of the probationary period. Written agreements serve to clarify expectations and establish clear terms, ensuring both parties are in alignment on the revised duration. This is essential for maintaining transparency and avoiding misunderstandings.

Other options, while they may initially seem feasible, do not adhere to best practices in human resources management. For instance, suggesting an indefinite extension at the employer's discretion lacks the checks and balances that a written agreement provides, which makes option B more favorable. Similarly, matching holiday breaks or extending the period by just one additional month does not account for the flexibility that a formally agreed-upon timeframe allows.