Si junto a la escalera, hay soportes adicionales de seguridad, se les debe utilizar:
a. en superficies húmedas o resbaladizas.
b. en superficies irregulares o inestables.
c. siempre que se use la escalera.
d. cuando se sube a más de 6 pies (1,83 m) de altura.
Answer: C
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