Which examples correctly apply the basic rules of abbreviation? (Multiple Answers)
Select one or more:
a. The car engine can reach a maximum of 6,000 RPM.
b. Surgeons are making increased use of l. a.s. e.r. technology.
c. The CFO turned up late for the meeting.
d. You must sign an NDA before starting work with us.
e. Employee benefits - e. g., sick pay and dental insurance - will be subject to new
conditions.
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f. The conference takes place between the first Fri. and Sunday of this month.

a. The car engine can reach a maximum of 6,000 RPM.  

c. The CFO turned up late for the meeting.

d. You must sign an NDA before starting work with us.

e. Employee benefits - e.g., sick pay and dental insurance - will be subject to new  conditions.

Explanation:

An abbreviation is the use of the shortened form of a word or phrase. Such abbreviations can be taken from the first letters of the words or phrase, or the initial first few letters of the word.

Among the given sentences, the sentences using correct abbreviation are as follows-

a. The car engine can reach a maximum of 6,000 RPM.

Here, RPM/rpm stands for revolutions per minute.  

c. The CFO turned up late for the meeting.

The CFO is the Chief Financial Officer.

d. You must sign an NDA before starting work with us.

An NDA means a Non-Disclosure Agreement.

e. Employee benefits - e.g., sick pay and dental insurance - will be subject to new  conditions.

Here, e.g. means "example", "for example".