a. Write the JavaScript function to validate the Mobile No as per the instructions given below:

a. Function name: phonenumber

b. The function must have a parameter to pass the mobile no input value.

c. Validation: Mobile No. must contain only 8 digits.

d. The function must display alert messages as follows:

If the validation is successful, Valid Oman Mobile Phone Number

If the validation fails, Invalid Oman Mobile Phone Number.

b. Write the JavaScript function to validate the Full Name as per the instructions given below:

a. Function name: checkAlphabet

b. The function must have a parameter to pass the full name input value.

c. Validation: The full name must contain only alphabetic characters.

d. The function must display alert messages as follows:

If the validation is successful, Successfully Registered

If the validation fails, NON Alphabetic characters are NOT allowed