Cpr should be initiated when: select one:

a. the carotid pulse is very weak.
b. rigor mortis is obvious.
c. a valid living will is unavailable.
d. signs of putrefaction are present.

a. the carotid pulse is very weak.

Explanation:

CPR is an attempt to save someones life when one is dying. This answer is correct because rigor mortis is the hardening of the body hours after death, a living will doesn't matter in this specific situation, putrefaction is talking about the signs of decay and that is far too late.

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