When lightning or thunder is present _____.

a. lifting and rigging operations should be halted immediately
b. lifting and rigging can proceed until radar indicates that lightning strikes are within 1 mile
c. lifting and rigging can proceed until radar indicates that lightning strikes are within 3 miles
d. lifting and rigging can proceed until radar indicates that lightning strikes are within 7 miles


a. lifting and rigging operations should be halted immediately

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