Check if the following identifiers are valid: 1. c 2. cat 3. n1m1 4. short1 5. _hello, 6. 42c, 7. hi there, 8. cat!

Only option 6 and 7 are not valid but the option 1,2,3,4,5 and 8 are valid.

Explanation:

Identifier means the name which is defined for any programming language. There is a need for a variable in any programming language which is used to store the value to perform the calculation with the help of instruction.There are 2 rules which state that how a user can define an identifier. They are as follows--

The above question wants to know that which option is valid or not which are as follows--

solution:

the right option is a

to adding   a new row to a table we   have to do process last table cell and pressing tab.

this is the process to add new row in the cell:

* to add a row below the cell, click insert below in the rows and columns group.

thus this is the required right answer.