In this type of password attack, the attacker has some information about the password. for example, the attacker knows the password contains a two- or three-digit number.
hybrid
nontechnical
rule-based
precomputed hashes

Non- technical

Explanation:

Non technical attacks also known as non- electronic attack. The non technical attack does not required any type of the technical domain knowledge and methods for intruding the other systems.

In the non technical password attack, the attacker contain some data or information regarding the password like two and three digits  and umber of the password. It basically search the data from the users trash bins and sticky notes from the users system.

On the other hand, all the the options are incorrect because it does not have some information and data regarding the password according to the given statement.

Therefore, non technical option is correct.  

which functions return a valid value without any arguments?

(-blank- and -blank- return a valid value without any arguments.)

1st -blank-

today

sqrt

count

2nd -blank-

round

now

sqrt