Which document is required for EVERY California employer with one or more employees?

Explanation

Labor Code section 6401.7 and section 3203 require EVERY California employer to establish, implement and maintain a written injury and illness prevention programme - no exemption by size, by industry or by hazard, which is exactly what makes it the answer here. The other three are real documents whose duty is conditional. A safety data sheet is owed for each hazardous chemical PRESENT, so an employer with none owes none (a). A confined space entry permit is owed only where a permit-required space is actually entered (c). And the Form 300 log carries partial exemptions: employers with ten or fewer employees throughout the previous calendar year, and establishments in certain lower-hazard industries, need not routinely keep it - though every employer still owes the serious-injury report under section 342.