The employer may deny a reasonable pregnancy-related accommodation based on undue hardship, which means an action requiring significant difficulty or expense, to the employer's program, enterprise or business for pregnancy accommodations listed in WAC 357-26-035 (1)(d) through (i). The employer may not claim undue hardship for the pregnancy accommodations listed in WAC 357-26-035 (1)(a) through (c) or for limits on lifting over seventeen pounds.